<?xml version="1.0" encoding="UTF-8"?>

<!--XBRL Document Created with the Workiva Platform-->
<!--Copyright 2026 Workiva-->
<!--r:2992a451-3ba5-485e-9960-2dff36323135,g:59931228-771b-4ca2-baf1-60fd3895fe2d-->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:link="http://www.xbrl.org/2003/linkbase" xmlns:vec="http://www.vectrusinc.com/20251231" xmlns:xbrli="http://www.xbrl.org/2003/instance" xmlns:dtr-types="http://www.xbrl.org/dtr/type/2024-01-31" xmlns:xbrldt="http://xbrl.org/2005/xbrldt" attributeFormDefault="unqualified" elementFormDefault="qualified" targetNamespace="http://www.vectrusinc.com/20251231">
  <xs:import namespace="http://fasb.org/srt/2025" schemaLocation="https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd"/>
  <xs:import namespace="http://fasb.org/us-gaap/2025" schemaLocation="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd"/>
  <xs:import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd"/>
  <xs:import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/country/2025" schemaLocation="https://xbrl.sec.gov/country/2025/country-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/cyd-af-sub/2025" schemaLocation="https://xbrl.sec.gov/cyd/2025/cyd-af-sub-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/ecd/2025" schemaLocation="https://xbrl.sec.gov/ecd/2025/ecd-2025.xsd"/>
  <xs:import namespace="http://xbrl.sec.gov/stpr/2025" schemaLocation="https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd"/>
  <xs:annotation>
    <xs:appinfo>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="vec-20251231_pre.xml" xlink:role="http://www.xbrl.org/2003/role/presentationLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="vec-20251231_def.xml" xlink:role="http://www.xbrl.org/2003/role/definitionLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="vec-20251231_lab.xml" xlink:role="http://www.xbrl.org/2003/role/labelLinkbaseRef" xlink:type="simple"/>
      <link:linkbaseRef xmlns:xlink="http://www.w3.org/1999/xlink" xlink:arcrole="http://www.w3.org/1999/xlink/properties/linkbase" xlink:href="vec-20251231_cal.xml" xlink:role="http://www.xbrl.org/2003/role/calculationLinkbaseRef" xlink:type="simple"/>
      <link:roleType id="CoverPage" roleURI="http://www.vectrusinc.com/role/CoverPage">
        <link:definition>0000001 - Document - Cover Page</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="AuditInformation" roleURI="http://www.vectrusinc.com/role/AuditInformation">
        <link:definition>0000002 - Document - Audit Information</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFINCOMELOSS" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDSTATEMENTSOFINCOMELOSS">
        <link:definition>9952151 - Statement - CONSOLIDATED STATEMENTS OF INCOME (LOSS)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSS">
        <link:definition>9952152 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETS" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDBALANCESHEETS">
        <link:definition>9952153 - Statement - CONSOLIDATED BALANCE SHEETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDBALANCESHEETSParenthetical" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDBALANCESHEETSParenthetical">
        <link:definition>9952154 - Statement - CONSOLIDATED BALANCE SHEETS (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCASHFLOWS" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDSTATEMENTSOFCASHFLOWS">
        <link:definition>9952155 - Statement - CONSOLIDATED STATEMENTS OF CASH FLOWS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDSTATEMENTSOFSHAREHOLDERSEQUITY">
        <link:definition>9952156 - Statement - CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSParenthetical" roleURI="http://www.vectrusinc.com/role/CONSOLIDATEDSTATEMENTSOFCOMPREHENSIVEINCOMELOSSParenthetical">
        <link:definition>9952157 - Statement - CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (Parenthetical)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES" roleURI="http://www.vectrusinc.com/role/DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIES">
        <link:definition>9952158 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RECENTACCOUNTINGSTANDARDSUPDATES" roleURI="http://www.vectrusinc.com/role/RECENTACCOUNTINGSTANDARDSUPDATES">
        <link:definition>9952159 - Disclosure - RECENT ACCOUNTING STANDARDS UPDATES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUE" roleURI="http://www.vectrusinc.com/role/REVENUE">
        <link:definition>9952160 - Disclosure - REVENUE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RECEIVABLES" roleURI="http://www.vectrusinc.com/role/RECEIVABLES">
        <link:definition>9952161 - Disclosure - RECEIVABLES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSLOSSPERSHARE" roleURI="http://www.vectrusinc.com/role/EARNINGSLOSSPERSHARE">
        <link:definition>9952162 - Disclosure - EARNINGS (LOSS) PER SHARE</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PROPERTYPLANTANDEQUIPMENTNET" roleURI="http://www.vectrusinc.com/role/PROPERTYPLANTANDEQUIPMENTNET">
        <link:definition>9952163 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDINTANGIBLEASSETS" roleURI="http://www.vectrusinc.com/role/GOODWILLANDINTANGIBLEASSETS">
        <link:definition>9952164 - Disclosure - GOODWILL AND INTANGIBLE ASSETS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONS" roleURI="http://www.vectrusinc.com/role/COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONS">
        <link:definition>9952165 - Disclosure - COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBT" roleURI="http://www.vectrusinc.com/role/DEBT">
        <link:definition>9952166 - Disclosure - DEBT</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVEINSTRUMENTS" roleURI="http://www.vectrusinc.com/role/DERIVATIVEINSTRUMENTS">
        <link:definition>9952167 - Disclosure - DERIVATIVE INSTRUMENTS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASES" roleURI="http://www.vectrusinc.com/role/LEASES">
        <link:definition>9952168 - Disclosure - LEASES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXES" roleURI="http://www.vectrusinc.com/role/INCOMETAXES">
        <link:definition>9952169 - Disclosure - INCOME TAXES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="POSTEMPLOYMENTBENEFITPLANS" roleURI="http://www.vectrusinc.com/role/POSTEMPLOYMENTBENEFITPLANS">
        <link:definition>9952170 - Disclosure - POST-EMPLOYMENT BENEFIT PLANS</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIES" roleURI="http://www.vectrusinc.com/role/COMMITMENTSANDCONTINGENCIES">
        <link:definition>9952171 - Disclosure - COMMITMENTS AND CONTINGENCIES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATION" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATION">
        <link:definition>9952172 - Disclosure - STOCK-BASED COMPENSATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREHOLDERSEQUITY" roleURI="http://www.vectrusinc.com/role/SHAREHOLDERSEQUITY">
        <link:definition>9952173 - Disclosure - SHAREHOLDERS' EQUITY</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SALEOFRECEIVABLES" roleURI="http://www.vectrusinc.com/role/SALEOFRECEIVABLES">
        <link:definition>9952174 - Disclosure - SALE OF RECEIVABLES</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATION" roleURI="http://www.vectrusinc.com/role/SEGMENTINFORMATION">
        <link:definition>9952175 - Disclosure - SEGMENT INFORMATION</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies" roleURI="http://www.vectrusinc.com/role/DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESPolicies">
        <link:definition>9955511 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Policies)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables" roleURI="http://www.vectrusinc.com/role/DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESTables">
        <link:definition>9955512 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUETables" roleURI="http://www.vectrusinc.com/role/REVENUETables">
        <link:definition>9955513 - Disclosure - REVENUE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RECEIVABLESTables" roleURI="http://www.vectrusinc.com/role/RECEIVABLESTables">
        <link:definition>9955514 - Disclosure - RECEIVABLES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSLOSSPERSHARETables" roleURI="http://www.vectrusinc.com/role/EARNINGSLOSSPERSHARETables">
        <link:definition>9955515 - Disclosure - EARNINGS (LOSS) PER SHARE (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PROPERTYPLANTANDEQUIPMENTNETTables" roleURI="http://www.vectrusinc.com/role/PROPERTYPLANTANDEQUIPMENTNETTables">
        <link:definition>9955516 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDINTANGIBLEASSETSTables" roleURI="http://www.vectrusinc.com/role/GOODWILLANDINTANGIBLEASSETSTables">
        <link:definition>9955517 - Disclosure - GOODWILL AND INTANGIBLE ASSETS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSTables" roleURI="http://www.vectrusinc.com/role/COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSTables">
        <link:definition>9955518 - Disclosure - COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTTables" roleURI="http://www.vectrusinc.com/role/DEBTTables">
        <link:definition>9955519 - Disclosure - DEBT (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVEINSTRUMENTSTables" roleURI="http://www.vectrusinc.com/role/DERIVATIVEINSTRUMENTSTables">
        <link:definition>9955520 - Disclosure - DERIVATIVE INSTRUMENTS (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESTables" roleURI="http://www.vectrusinc.com/role/LEASESTables">
        <link:definition>9955521 - Disclosure - LEASES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESTables" roleURI="http://www.vectrusinc.com/role/INCOMETAXESTables">
        <link:definition>9955522 - Disclosure - INCOME TAXES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONTables" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONTables">
        <link:definition>9955523 - Disclosure - STOCK-BASED COMPENSATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SALEOFRECEIVABLESTables" roleURI="http://www.vectrusinc.com/role/SALEOFRECEIVABLESTables">
        <link:definition>9955524 - Disclosure - SALE OF RECEIVABLES (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONTables" roleURI="http://www.vectrusinc.com/role/SEGMENTINFORMATIONTables">
        <link:definition>9955525 - Disclosure - SEGMENT INFORMATION (Tables)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESAdditionalInformationDetails">
        <link:definition>9955526 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofUsefulLivesDetails" roleURI="http://www.vectrusinc.com/role/DESCRIPTIONOFBUSINESSANDSUMMARYOFSIGNIFICANTACCOUNTINGPOLICIESScheduleofUsefulLivesDetails">
        <link:definition>9955527 - Disclosure - DESCRIPTION OF BUSINESS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Useful Lives (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuePerformanceObligationsDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenuePerformanceObligationsDetails">
        <link:definition>9955528 - Disclosure - REVENUE - Revenue Performance Obligations (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuePerformanceObligationsPercentageandRemainingPeriodofTimeDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenuePerformanceObligationsPercentageandRemainingPeriodofTimeDetails">
        <link:definition>9955529 - Disclosure - REVENUE - Revenue Performance Obligations (Percentage and Remaining Period of Time) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuePerformanceObligationsPercentageandRemainingPeriodofTimeDetails_1" roleURI="http://www.vectrusinc.com/role/REVENUERevenuePerformanceObligationsPercentageandRemainingPeriodofTimeDetails_1">
        <link:definition>9955529 - Disclosure - REVENUE - Revenue Performance Obligations (Percentage and Remaining Period of Time) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenueContractEstimatesDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenueContractEstimatesDetails">
        <link:definition>9955530 - Disclosure - REVENUE - Revenue Contract Estimates (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuebyContractTypeDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenuebyContractTypeDetails">
        <link:definition>9955531 - Disclosure - REVENUE - Revenue by Contract Type (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuebyGeographicRegionDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenuebyGeographicRegionDetails">
        <link:definition>9955532 - Disclosure - REVENUE - Revenue by Geographic Region (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuebyContractRelationshipDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenuebyContractRelationshipDetails">
        <link:definition>9955533 - Disclosure - REVENUE - Revenue by Contract Relationship (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenuebyCustomerDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenuebyCustomerDetails">
        <link:definition>9955534 - Disclosure - REVENUE - Revenue by Customer (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="REVENUERevenueContractBalancesDetails" roleURI="http://www.vectrusinc.com/role/REVENUERevenueContractBalancesDetails">
        <link:definition>9955535 - Disclosure - REVENUE - Revenue Contract Balances (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="RECEIVABLESDetails" roleURI="http://www.vectrusinc.com/role/RECEIVABLESDetails">
        <link:definition>9955536 - Disclosure - RECEIVABLES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSLOSSPERSHAREScheduleofBasicandDilutedWeightedAverageSharesOutstandingDetails" roleURI="http://www.vectrusinc.com/role/EARNINGSLOSSPERSHAREScheduleofBasicandDilutedWeightedAverageSharesOutstandingDetails">
        <link:definition>9955537 - Disclosure - EARNINGS (LOSS) PER SHARE - Schedule of Basic and Diluted Weighted Average Shares Outstanding (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="EARNINGSLOSSPERSHAREAntidilutiveSecuritiesDetails" roleURI="http://www.vectrusinc.com/role/EARNINGSLOSSPERSHAREAntidilutiveSecuritiesDetails">
        <link:definition>9955538 - Disclosure - EARNINGS (LOSS) PER SHARE - Anti-dilutive Securities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PROPERTYPLANTANDEQUIPMENTNETScheduleofPropertyPlantandEquipmentNetDetails" roleURI="http://www.vectrusinc.com/role/PROPERTYPLANTANDEQUIPMENTNETScheduleofPropertyPlantandEquipmentNetDetails">
        <link:definition>9955539 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET - Schedule of Property, Plant and Equipment, Net (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="PROPERTYPLANTANDEQUIPMENTNETAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/PROPERTYPLANTANDEQUIPMENTNETAdditionalInformationDetails">
        <link:definition>9955540 - Disclosure - PROPERTY, PLANT AND EQUIPMENT, NET - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDINTANGIBLEASSETSNarrativeDetails" roleURI="http://www.vectrusinc.com/role/GOODWILLANDINTANGIBLEASSETSNarrativeDetails">
        <link:definition>9955541 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDINTANGIBLEASSETSScheduleofGoodwillDetails" roleURI="http://www.vectrusinc.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofGoodwillDetails">
        <link:definition>9955542 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDINTANGIBLEASSETSScheduleofIdentifiableAssetsDetails" roleURI="http://www.vectrusinc.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofIdentifiableAssetsDetails">
        <link:definition>9955543 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Identifiable Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="GOODWILLANDINTANGIBLEASSETSScheduleofAmortizationExpenseDetails" roleURI="http://www.vectrusinc.com/role/GOODWILLANDINTANGIBLEASSETSScheduleofAmortizationExpenseDetails">
        <link:definition>9955544 - Disclosure - GOODWILL AND INTANGIBLE ASSETS - Schedule of Amortization Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSScheduleofPrepaidExpensesAndOtherCurrentAssetsDetails" roleURI="http://www.vectrusinc.com/role/COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSScheduleofPrepaidExpensesAndOtherCurrentAssetsDetails">
        <link:definition>9955545 - Disclosure - COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS - Schedule of Prepaid Expenses And Other Current Assets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSScheduleofCompensationandOtherEmployeeBenefitsDetails" roleURI="http://www.vectrusinc.com/role/COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSScheduleofCompensationandOtherEmployeeBenefitsDetails">
        <link:definition>9955546 - Disclosure - COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS - Schedule of Compensation and Other Employee Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSScheduleofOtherAccruedLiabilitiesDetails" roleURI="http://www.vectrusinc.com/role/COMPOSITIONOFCERTAINFINANCIALSTATEMENTCAPTIONSScheduleofOtherAccruedLiabilitiesDetails">
        <link:definition>9955547 - Disclosure - COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS - Schedule of Other Accrued Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/DEBTAdditionalInformationDetails">
        <link:definition>9955548 - Disclosure - DEBT - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DEBTScheduleofMaturitiesofTermFacilityDetails" roleURI="http://www.vectrusinc.com/role/DEBTScheduleofMaturitiesofTermFacilityDetails">
        <link:definition>9955549 - Disclosure - DEBT - Schedule of Maturities of Term Facility (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVEINSTRUMENTSAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/DERIVATIVEINSTRUMENTSAdditionalInformationDetails">
        <link:definition>9955550 - Disclosure - DERIVATIVE INSTRUMENTS - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="DERIVATIVEINSTRUMENTSInterestRateHedgesintheConsolidatedBalanceSheetsDetails" roleURI="http://www.vectrusinc.com/role/DERIVATIVEINSTRUMENTSInterestRateHedgesintheConsolidatedBalanceSheetsDetails">
        <link:definition>9955551 - Disclosure - DERIVATIVE INSTRUMENTS - Interest Rate Hedges in the Consolidated Balance Sheets (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/LEASESAdditionalInformationDetails">
        <link:definition>9955552 - Disclosure - LEASES - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESComponentsofLeaseExpenseDetails" roleURI="http://www.vectrusinc.com/role/LEASESComponentsofLeaseExpenseDetails">
        <link:definition>9955553 - Disclosure - LEASES - Components of Lease Expense (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESAssetsandLiabilitiesDetails" roleURI="http://www.vectrusinc.com/role/LEASESAssetsandLiabilitiesDetails">
        <link:definition>9955554 - Disclosure - LEASES - Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofMaturitiesofLeaseLiabilitiesDetails" roleURI="http://www.vectrusinc.com/role/LEASESScheduleofMaturitiesofLeaseLiabilitiesDetails">
        <link:definition>9955555 - Disclosure - LEASES - Schedule of Maturities of Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="LEASESScheduleofMaturitiesofLeaseLiabilitiesDetails_1" roleURI="http://www.vectrusinc.com/role/LEASESScheduleofMaturitiesofLeaseLiabilitiesDetails_1">
        <link:definition>9955555 - Disclosure - LEASES - Schedule of Maturities of Lease Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESScheduleofComponentsofIncomeTaxExpenseBenefitDetails" roleURI="http://www.vectrusinc.com/role/INCOMETAXESScheduleofComponentsofIncomeTaxExpenseBenefitDetails">
        <link:definition>9955556 - Disclosure - INCOME TAXES - Schedule of Components of Income Tax Expense (Benefit) (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESScheduleofEffectiveIncomeTaxRateReconciliationDetails" roleURI="http://www.vectrusinc.com/role/INCOMETAXESScheduleofEffectiveIncomeTaxRateReconciliationDetails">
        <link:definition>9955557 - Disclosure - INCOME TAXES - Schedule of Effective Income Tax Rate Reconciliation (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/INCOMETAXESAdditionalInformationDetails">
        <link:definition>9955558 - Disclosure - INCOME TAXES - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESIncomeTaxesPaidNetofRefundsReceivedDetails" roleURI="http://www.vectrusinc.com/role/INCOMETAXESIncomeTaxesPaidNetofRefundsReceivedDetails">
        <link:definition>9955559 - Disclosure - INCOME TAXES - Income Taxes Paid, Net of Refunds Received (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESScheduleofDeferredTaxAssetsandLiabilitiesDetails" roleURI="http://www.vectrusinc.com/role/INCOMETAXESScheduleofDeferredTaxAssetsandLiabilitiesDetails">
        <link:definition>9955560 - Disclosure - INCOME TAXES - Schedule of Deferred Tax Assets and Liabilities (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="INCOMETAXESScheduleofUnrecognizedTaxBenefitsDetails" roleURI="http://www.vectrusinc.com/role/INCOMETAXESScheduleofUnrecognizedTaxBenefitsDetails">
        <link:definition>9955561 - Disclosure - INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="POSTEMPLOYMENTBENEFITPLANSDetails" roleURI="http://www.vectrusinc.com/role/POSTEMPLOYMENTBENEFITPLANSDetails">
        <link:definition>9955562 - Disclosure - POST-EMPLOYMENT BENEFIT PLANS (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="COMMITMENTSANDCONTINGENCIESDetails" roleURI="http://www.vectrusinc.com/role/COMMITMENTSANDCONTINGENCIESDetails">
        <link:definition>9955563 - Disclosure - COMMITMENTS AND CONTINGENCIES (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONAdditionalInformationDetails" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONAdditionalInformationDetails">
        <link:definition>9955564 - Disclosure - STOCK-BASED COMPENSATION - Additional Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONScheduleofImpactofStockBasedCompensationinConsolidatedandCombinedStatementsofIncomeDetails" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONScheduleofImpactofStockBasedCompensationinConsolidatedandCombinedStatementsofIncomeDetails">
        <link:definition>9955565 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Impact of Stock-Based Compensation in Consolidated and Combined Statements of Income (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONScheduleofNonQualifiedStockOptionsActivityDetails" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONScheduleofNonQualifiedStockOptionsActivityDetails">
        <link:definition>9955566 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Non-Qualified Stock Options, Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONScheduleofNonQualifiedStockOptionsOutstandingandExercisableDetails" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONScheduleofNonQualifiedStockOptionsOutstandingandExercisableDetails">
        <link:definition>9955567 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Non-Qualified Stock Options Outstanding and Exercisable (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONScheduleofRestrictedStockUnitsActivityDetails" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONScheduleofRestrictedStockUnitsActivityDetails">
        <link:definition>9955568 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Restricted Stock Units, Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="STOCKBASEDCOMPENSATIONScheduleofPerformanceShareUnitsActivityDetails" roleURI="http://www.vectrusinc.com/role/STOCKBASEDCOMPENSATIONScheduleofPerformanceShareUnitsActivityDetails">
        <link:definition>9955569 - Disclosure - STOCK-BASED COMPENSATION - Schedule of Performance Share Units, Activity (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SHAREHOLDERSEQUITYDetails" roleURI="http://www.vectrusinc.com/role/SHAREHOLDERSEQUITYDetails">
        <link:definition>9955570 - Disclosure - SHAREHOLDERS' EQUITY (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SALEOFRECEIVABLESNarrativeDetails" roleURI="http://www.vectrusinc.com/role/SALEOFRECEIVABLESNarrativeDetails">
        <link:definition>9955571 - Disclosure - SALE OF RECEIVABLES - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SALEOFRECEIVABLESScheduleofReceivablesSoldDetails" roleURI="http://www.vectrusinc.com/role/SALEOFRECEIVABLESScheduleofReceivablesSoldDetails">
        <link:definition>9955572 - Disclosure - SALE OF RECEIVABLES - Schedule of Receivables Sold (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONNarrativeDetails" roleURI="http://www.vectrusinc.com/role/SEGMENTINFORMATIONNarrativeDetails">
        <link:definition>9955573 - Disclosure - SEGMENT INFORMATION - Narrative (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
      <link:roleType id="SEGMENTINFORMATIONScheduleofSegmentRoportingInformationDetails" roleURI="http://www.vectrusinc.com/role/SEGMENTINFORMATIONScheduleofSegmentRoportingInformationDetails">
        <link:definition>9955574 - Disclosure - SEGMENT INFORMATION - Schedule of Segment Roporting Information (Details)</link:definition>
        <link:usedOn>link:presentationLink</link:usedOn>
        <link:usedOn>link:calculationLink</link:usedOn>
        <link:usedOn>link:definitionLink</link:usedOn>
      </link:roleType>
    </xs:appinfo>
  </xs:annotation>
  <xs:element id="vec_AuditInformationAbstract" abstract="true" name="AuditInformationAbstract" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="vec_TreasuryStockIncurredButNotYetPaid" abstract="false" name="TreasuryStockIncurredButNotYetPaid" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_ScheduleofCompensationandOtherEmployeeBenefitsTableTextBlock" abstract="false" name="ScheduleofCompensationandOtherEmployeeBenefitsTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="vec_AssetsAndLiabilitiesLesseeTableTextBlock" abstract="false" name="AssetsAndLiabilitiesLesseeTableTextBlock" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType"/>
  <xs:element id="vec_AccountingPoliciesTable" abstract="true" name="AccountingPoliciesTable" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType"/>
  <xs:element id="vec_HighDesertSupportServicesHDSSMember" abstract="true" name="HighDesertSupportServicesHDSSMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_JJMaintenanceMember" abstract="true" name="JJMaintenanceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_ServcoreResourcesAndServicesSolutionsLLCMember" abstract="true" name="ServcoreResourcesAndServicesSolutionsLLCMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_InuksukASMember" abstract="true" name="InuksukASMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_AccountingPoliciesLineItems" abstract="true" name="AccountingPoliciesLineItems" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="vec_LesseeOperatingLeaseNumberOfOptionsToRenewOrTerminate" abstract="false" name="LesseeOperatingLeaseNumberOfOptionsToRenewOrTerminate" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="vec_FurnitureFixturesComputerEquipmentAndSoftwareMember" abstract="true" name="FurnitureFixturesComputerEquipmentAndSoftwareMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_RevenueFromContractWithCustomerContractTerm" abstract="false" name="RevenueFromContractWithCustomerContractTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="vec_RevenueFromContractWithCustomerRenewalOptionTerm" abstract="false" name="RevenueFromContractWithCustomerRenewalOptionTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="vec_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueFavorableChangeInMeasureOfProgressAndModificationOfContract" abstract="false" name="ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueFavorableChangeInMeasureOfProgressAndModificationOfContract" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueFavorableOperatingIncomeChangeInMeasureOfProgressAndModificationOfContract" abstract="false" name="ContractWithCustomerLiabilityCumulativeCatchUpAdjustmentToRevenueFavorableOperatingIncomeChangeInMeasureOfProgressAndModificationOfContract" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_CostPlusAndCostReimbursableMember" abstract="true" name="CostPlusAndCostReimbursableMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_ContractRelationshipAxis" abstract="true" name="ContractRelationshipAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="vec_ContractRelationshipDomain" abstract="true" name="ContractRelationshipDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_PrimeContractorMember" abstract="true" name="PrimeContractorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_SubcontractorMember" abstract="true" name="SubcontractorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_ArmyMember" abstract="true" name="ArmyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_NavyMember" abstract="true" name="NavyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_AirForceMember" abstract="true" name="AirForceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_OtherCustomersMember" abstract="true" name="OtherCustomersMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_OrderOrProductionBacklogAndRecometesMember" abstract="true" name="OrderOrProductionBacklogAndRecometesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_PayablesFromSaleOfAccountsReceivableCurrent" abstract="false" name="PayablesFromSaleOfAccountsReceivableCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_ContractAndOtherReservesCurrent" abstract="false" name="ContractAndOtherReservesCurrent" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_VertexFirstLienCreditAgreementMember" abstract="true" name="VertexFirstLienCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_FirstLienInitialTermTrancheMember" abstract="true" name="FirstLienInitialTermTrancheMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_FirstLienIncrementalTermTrancheMember" abstract="true" name="FirstLienIncrementalTermTrancheMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_NewTermLoansMember" abstract="true" name="NewTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_VertexFirstLienTermFacilityMember" abstract="true" name="VertexFirstLienTermFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_ExistingTermLoansWithNewTermLoansMember" abstract="true" name="ExistingTermLoansWithNewTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_VertexSecondLienTermFacilityMember" abstract="true" name="VertexSecondLienTermFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_VertexABLCreditAgreementMember" abstract="true" name="VertexABLCreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_A2023CreditAgreementNewTermLoansMember" abstract="true" name="A2023CreditAgreementNewTermLoansMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_A2023CreditAgreementMember" abstract="true" name="A2023CreditAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_SeniorSecuredCreditFacilitiesMember" abstract="true" name="SeniorSecuredCreditFacilitiesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_TermFacilityMember" abstract="true" name="TermFacilityMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_DebtInstrumentUnusedCapacityAxis" abstract="true" name="DebtInstrumentUnusedCapacityAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="vec_DebtInstrumentUnusedCapacityDomain" abstract="true" name="DebtInstrumentUnusedCapacityDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_EqualToOrLessThan50Member" abstract="true" name="EqualToOrLessThan50Member" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_AmortizationOfDebtDiscountPremiumPerQuarter" abstract="false" name="AmortizationOfDebtDiscountPremiumPerQuarter" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_LineOfCreditFacilityLetterOfCreditFrontingFee" abstract="false" name="LineOfCreditFacilityLetterOfCreditFrontingFee" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_LineofCreditFacilityCovenantTermsMaximumDebttoEBITDARatio" abstract="false" name="LineofCreditFacilityCovenantTermsMaximumDebttoEBITDARatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="vec_LineOfCreditFacilityCovenantTermsStepDownDebtToEBITDARatio" abstract="false" name="LineOfCreditFacilityCovenantTermsStepDownDebtToEBITDARatio" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="vec_LineofCreditCovenantTermsMinimumEBITDAtoInterestExpenseRatio" abstract="false" name="LineofCreditCovenantTermsMinimumEBITDAtoInterestExpenseRatio" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="vec_TermFacilityAndAmendedRevolverMember" abstract="true" name="TermFacilityAndAmendedRevolverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_DerivativeInitialContractAmount" abstract="false" name="DerivativeInitialContractAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationTaxCreditResearchNetOfAdjustmentsAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditResearchNetOfAdjustmentsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationTaxCreditWorkOpportunityTaxCreditNetAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditWorkOpportunityTaxCreditNetAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDividendReceivedDeductionAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDividendReceivedDeductionAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUnrealizedLossGainAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUnrealizedLossGainAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainmentNetOfAdjustmentsAmount" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainmentNetOfAdjustmentsAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationTaxCreditResearchNetOfAdjustmentsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditResearchNetOfAdjustmentsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationTaxCreditWorkOpportunityTaxCreditNetPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationTaxCreditWorkOpportunityTaxCreditNetPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDividendReceivedDeductionPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDividendReceivedDeductionPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUnrealizedLossGainPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseUnrealizedLossGainPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainmentNetOfAdjustmentsPercent" abstract="false" name="EffectiveIncomeTaxRateReconciliationNondeductibleExpenseMealsAndEntertainmentNetOfAdjustmentsPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_DeferredTaxAssetsTaxDeferredExpenseLeaseLiability" abstract="false" name="DeferredTaxAssetsTaxDeferredExpenseLeaseLiability" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_DeferredTaxLiabilitiesUnbilledReceivables" abstract="false" name="DeferredTaxLiabilitiesUnbilledReceivables" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_DeferredTaxLiabilitiesRightOfUseAssets" abstract="false" name="DeferredTaxLiabilitiesRightOfUseAssets" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_NumberOfDefinedContributionPlan" abstract="false" name="NumberOfDefinedContributionPlan" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="vec_ContractComplianceMember" abstract="true" name="ContractComplianceMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_ShareBasedCompensationAwardByInstrumentTypeAxis" abstract="true" name="ShareBasedCompensationAwardByInstrumentTypeAxis" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType"/>
  <xs:element id="vec_ShareBasedCompensationAwardByInstrumentTypeDomain" abstract="true" name="ShareBasedCompensationAwardByInstrumentTypeDomain" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_EquityBasedAwardsMember" abstract="true" name="EquityBasedAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_NonQualifiedStockOptionsMember" abstract="true" name="NonQualifiedStockOptionsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_PerformanceShareUnitsPSUsMember" abstract="true" name="PerformanceShareUnitsPSUsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_A2014OmnibusIncentivePlanMember" abstract="true" name="A2014OmnibusIncentivePlanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_NumberOfPerformanceBasedAwards" abstract="false" name="NumberOfPerformanceBasedAwards" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="vec_SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceBasedAwardPercentagePaymentofAggregateTargetValueofSharesIssued" abstract="false" name="SharebasedCompensationArrangementbySharebasedPaymentAwardPerformanceBasedAwardPercentagePaymentofAggregateTargetValueofSharesIssued" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="vec_LiabilityBasedAwardsMember" abstract="true" name="LiabilityBasedAwardsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_RangeofExercisePricesOneMember" abstract="true" name="RangeofExercisePricesOneMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="vec_TransfersOfFinancialAssetsAccountedForAsSaleSecuritizationFacilityAvailabilityMaximum" abstract="false" name="TransfersOfFinancialAssetsAccountedForAsSaleSecuritizationFacilityAvailabilityMaximum" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_TransferOfFinancialAssetsAccountedForAsSalesPurchaseDiscountFees" abstract="false" name="TransferOfFinancialAssetsAccountedForAsSalesPurchaseDiscountFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_TransfersOfFinancialAssetsAccountedForAsSaleRollForward" abstract="true" name="TransfersOfFinancialAssetsAccountedForAsSaleRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="vec_TransfersOfFinancialAssetsAccountedForAsSaleSecuritizationFacilityAvailability" abstract="false" name="TransfersOfFinancialAssetsAccountedForAsSaleSecuritizationFacilityAvailability" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_TransferOfFinancialAssetsAccountedForAsSalesCashCollected" abstract="false" name="TransferOfFinancialAssetsAccountedForAsSalesCashCollected" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_TransferOfFinancialAssetsAccountedForAsSalesSalesCollectedButNotYetRemitted" abstract="false" name="TransferOfFinancialAssetsAccountedForAsSalesSalesCollectedButNotYetRemitted" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_TransferOfFinancialAssetsAccountedForAsSalesSalesCollectedAndRemitted" abstract="false" name="TransferOfFinancialAssetsAccountedForAsSalesSalesCollectedAndRemitted" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_TransferOfFinancialAssetsAccountedForAsSalesSalesCollectedAndRemittedFromOperatingActivities" abstract="false" name="TransferOfFinancialAssetsAccountedForAsSalesSalesCollectedAndRemittedFromOperatingActivities" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="vec_ReportableSegmentMember" abstract="true" name="ReportableSegmentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
</xs:schema>
