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  <xsd:element id="ldos_AccountingStandardsUpdatesAdoptedPolicyTextBlock" name="AccountingStandardsUpdatesAdoptedPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_AccountingStandardsUpdatesIssuedButNotYetAdoptedPolicyTextBlock" name="AccountingStandardsUpdatesIssuedButNotYetAdoptedPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_AccountsReceivableBilledAndBillable" name="AccountsReceivableBilledAndBillable" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_AccountsReceivableUnbillableAndContractRetentions" name="AccountsReceivableUnbillableAndContractRetentions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTaxEffect" name="AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesTaxEffect" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" name="AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect" name="AccumulatedOtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTaxEffect" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_AccumulatedOtherComprehensiveIncomeLossTax" name="AccumulatedOtherComprehensiveIncomeLossTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_AchievementofMilestonesMember" name="AchievementofMilestonesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_AdjustmentstoAdditionalPaidinCapitalContributionPaidforDivesture" name="AdjustmentstoAdditionalPaidinCapitalContributionPaidforDivesture" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_AdjustmentstoAdditionalPaidinCapitalContributionReceviedfromDivestures" name="AdjustmentstoAdditionalPaidinCapitalContributionReceviedfromDivestures" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_AllocatedSharebasedCompensationExpenseAdditionalUnvestedAwards" name="AllocatedSharebasedCompensationExpenseAdditionalUnvestedAwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_AllocatedSharebasedCompensationExpenseAdditionalVestedAwards" name="AllocatedSharebasedCompensationExpenseAdditionalVestedAwards" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_AwardsVestingPeriod" name="AwardsVestingPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_BasisForAttributingRevenuesFromExternalCustomers" name="BasisForAttributingRevenuesFromExternalCustomers" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_BechtelSaicCompanyLlcMember" name="BechtelSaicCompanyLlcMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_BreachOfContractMember" name="BreachOfContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_BuildingImprovementsAndLeaseholdImprovementsMember" name="BuildingImprovementsAndLeaseholdImprovementsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_BusinessAcquisitionPercentageOfAcquiredStock" name="BusinessAcquisitionPercentageOfAcquiredStock" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedNonTaxDeductibleAmount" name="BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedNonTaxDeductibleAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_BusinessCombinationAllocationOfPurchasePriceLineItems" name="BusinessCombinationAllocationOfPurchasePriceLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_BusinessCombinationAllocationOfPurchasePriceTable" name="BusinessCombinationAllocationOfPurchasePriceTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNotePayableNetofDebtDiscount" name="BusinessCombinationRecognizedIdentifiableAssetsAcquiredandLiabilitiesAssumedNotePayableNetofDebtDiscount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="ldos_CapacityofPowerPlant" name="CapacityofPowerPlant" nillable="true" substitutionGroup="xbrli:item" type="num:powerItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_CapitalLeasesAndOtherNotesPayableDueOnVariousDatesThroughFiscalTwoThousandTwentyOneMember" name="CapitalLeasesAndOtherNotesPayableDueOnVariousDatesThroughFiscalTwoThousandTwentyOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_CarlyleGroupMember" name="CarlyleGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_CashAndCashEquivalentsOriginalMaturityPeriod" name="CashAndCashEquivalentsOriginalMaturityPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_CashGrantNoteMember" name="CashGrantNoteMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ChangesInEstimatesOnContractsPolicyTextBlock" name="ChangesInEstimatesOnContractsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ClosingMember" name="ClosingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_CollectionsInExcessOfRevenuesAndDeferredRevenue" name="CollectionsInExcessOfRevenuesAndDeferredRevenue" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_ComponentsOfCommonStockAxis" name="ComponentsOfCommonStockAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ComponentsOfCommonStockByTypeDomain" name="ComponentsOfCommonStockByTypeDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_CompositionOfCertainFinancialStatementCaptionsTextBlock" name="CompositionOfCertainFinancialStatementCaptionsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ConcentrationOfCreditRiskPolicyTextBlock" name="ConcentrationOfCreditRiskPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ConnecticutLightandPowerMember" name="ConnecticutLightandPowerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ConsolidatedCasesNumberOfLawsuits" name="ConsolidatedCasesNumberOfLawsuits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:positiveIntegerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ConstructionNoteMember" name="ConstructionNoteMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ContingentLeaseObligationNotIncludedInFutureMinimumPayments" name="ContingentLeaseObligationNotIncludedInFutureMinimumPayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_ContractsByThirdPartyAxis" name="ContractsByThirdPartyAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ContractsByThirdPartyDomain" name="ContractsByThirdPartyDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_CreditMonitoringTerm" name="CreditMonitoringTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_CumulativeContractLosses" name="CumulativeContractLosses" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_DataPrivacyLitigationMember" name="DataPrivacyLitigationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_DebtInstrumentInterestRateStatedPercentagePaidinCash" name="DebtInstrumentInterestRateStatedPercentagePaidinCash" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_DecreaseInShareFactor" name="DecreaseInShareFactor" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_DeferredProsecutionAgreementProvidesMonitorServicePeriod" name="DeferredProsecutionAgreementProvidesMonitorServicePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_DefinedBenefitPlanPlanParticipantsTransferToPensionPlanAsset" name="DefinedBenefitPlanPlanParticipantsTransferToPensionPlanAsset" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_DefinedBenefitPlanPlanParticipantsTransferToPensionPlanObligation" name="DefinedBenefitPlanPlanParticipantsTransferToPensionPlanObligation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_DisclosureLeasesAdditionalInformationAbstract" name="DisclosureLeasesAdditionalInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_DisclosureScheduleOfCertainFinancialStatementCaptionsAbstract" name="DisclosureScheduleOfCertainFinancialStatementCaptionsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_DiscontinuedOperationSaleProceedsFromDisposalOfDiscontinuedOperations" name="DiscontinuedOperationSaleProceedsFromDisposalOfDiscontinuedOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_DiscontinuedOperationsLineItems" name="DiscontinuedOperationsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_DiscontinuedOperationsTable" name="DiscontinuedOperationsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_DiscountonEarlyTerminationFees" name="DiscountonEarlyTerminationFees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_DisposalGroupIncludingDiscontinuedOperationInventoryPrepaidandOtherCurrentAssets" name="DisposalGroupIncludingDiscontinuedOperationInventoryPrepaidandOtherCurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_DisposalGroupIncludingDiscontinuedOperationNotePayableandLongtermDebt" name="DisposalGroupIncludingDiscontinuedOperationNotePayableandLongtermDebt" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="ldos_DisposalGroupIncludingDiscontinuedOperationSellingGeneralandAdministrativeExpense" name="DisposalGroupIncludingDiscontinuedOperationSellingGeneralandAdministrativeExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_DistributionuponSeparation" name="DistributionuponSeparation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_DocumentDocumentandEntityInformationAbstract" name="DocumentDocumentandEntityInformationAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_EarlyRepaymentofDebtPrincipal" name="EarlyRepaymentofDebtPrincipal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_EarlyTerminationFees" name="EarlyTerminationFees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_EarningsPerShareLineItems" name="EarningsPerShareLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_EarningsPerShareTable" name="EarningsPerShareTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ElectricGenerationFacilityGross" name="ElectricGenerationFacilityGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_EmployeeStockPurchasePlanMember" name="EmployeeStockPurchasePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_FairfaxCountyVirginiaOneOfficeBuildingMember" name="FairfaxCountyVirginiaOneOfficeBuildingMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_FairfaxCountyVirginiaTwoOfficeBuildingsMember" name="FairfaxCountyVirginiaTwoOfficeBuildingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_FalseClaimsActClaimsMember" name="FalseClaimsActClaimsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_FinancialInstrumentsPolicyTextBlock" name="FinancialInstrumentsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_FiniteLivedIndefiniteLivedIntangibleAssetsandGoodwillAcquiredasPartofBusinessCombinationTableTextBlock" name="FiniteLivedIndefiniteLivedIntangibleAssetsandGoodwillAcquiredasPartofBusinessCombinationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ForwardContractIndexedtoIssuersEquityAmount" name="ForwardContractIndexedtoIssuersEquityAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_FuelSupplyAgreementTerm" name="FuelSupplyAgreementTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GenerationFacilityMember" name="GenerationFacilityMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GoodwillAndIntangibleAssetsDisclosureLineItems" name="GoodwillAndIntangibleAssetsDisclosureLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GoodwillAndIntangibleAssetsDisclosureTable" name="GoodwillAndIntangibleAssetsDisclosureTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GovernmentInvestigationsAndReviewsMember" name="GovernmentInvestigationsAndReviewsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GreekGovernmentContractMember" name="GreekGovernmentContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GroupOneMember" name="GroupOneMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_GroupTwoMember" name="GroupTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_HealthEnergyandEngineeringGroupMember" name="HealthEnergyandEngineeringGroupMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_HealthandEngineeringMember" name="HealthandEngineeringMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_IncomeTaxContingencyAxis" name="IncomeTaxContingencyAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_IncomeTaxContingencyDomain" name="IncomeTaxContingencyDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncomeTaxReconciliationNonDeductiblePenalties" name="IncomeTaxReconciliationNonDeductiblePenalties" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncomeTaxReconciliationTaxCreditsManufacturingActivityBenefit" name="IncomeTaxReconciliationTaxCreditsManufacturingActivityBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncomeTaxReconciliationUncertainTaxLiability" name="IncomeTaxReconciliationUncertainTaxLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_IncomeTaxesLineItems" name="IncomeTaxesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_IncomeTaxesTable" name="IncomeTaxesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncreaseDecreaseInAccruedStockRepurchases" name="IncreaseDecreaseInAccruedStockRepurchases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncreaseDecreaseInCashAndCashEquivalentsFromContinuingOperations" name="IncreaseDecreaseInCashAndCashEquivalentsFromContinuingOperations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimates" name="IncreaseDecreaseInIncomeFromChangeInContractEstimates" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncreaseDecreaseInIncomeFromChangeInContractEstimatesPerDilutedShare" name="IncreaseDecreaseInIncomeFromChangeInContractEstimatesPerDilutedShare" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_IncrementalShareFactor" name="IncrementalShareFactor" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_IntangibleAssetsGross" name="IntangibleAssetsGross" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_InterestRateOnEachYear" name="InterestRateOnEachYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_InventoryPrepaidExpensesAndOtherCurrentAssetsAbstract" name="InventoryPrepaidExpensesAndOtherCurrentAssetsAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_InvoiceForUndisputedPortionOfContractMember" name="InvoiceForUndisputedPortionOfContractMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_JudgmentRescindedOnAppeal" name="JudgmentRescindedOnAppeal" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_JudgmentsOrSettlementsRelatingToClaims" name="JudgmentsOrSettlementsRelatingToClaims" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="ldos_LeaseTerminationandFacilityConsolidationExpense" name="LeaseTerminationandFacilityConsolidationExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LeasesLineItems" name="LeasesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LeasesTable" name="LeasesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_LegalAndAccountingServicesExpense" name="LegalAndAccountingServicesExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LegalProceedingsAndRelatedMattersAxis" name="LegalProceedingsAndRelatedMattersAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LegalProceedingsAndRelatedMattersDomain" name="LegalProceedingsAndRelatedMattersDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LegalProceedingsLineItems" name="LegalProceedingsLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LegalProceedingsTable" name="LegalProceedingsTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LettersOfCreditRelatedSystemSupportAndMaintenanceMember" name="LettersOfCreditRelatedSystemSupportAndMaintenanceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_LettersOfCreditRelatingToDeliveryMember" name="LettersOfCreditRelatingToDeliveryMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_LiabilityForUncertainTaxPositions" name="LiabilityForUncertainTaxPositions" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="ldos_LineOfCreditFacilitiesTextBlock" name="LineOfCreditFacilitiesTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_LineOfCreditFacilityMaturityYear" name="LineOfCreditFacilityMaturityYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:gYearItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_LongTermDebtBeforeUnamortizedDiscount" name="LongTermDebtBeforeUnamortizedDiscount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="ldos_LossContingencyClaimsResolved" name="LossContingencyClaimsResolved" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_MaxITHealthcareHoldingsInc.Member" name="MaxITHealthcareHoldingsInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_MaximumPercentageThatWillUltimatelyVestForSharesProvidedUnderLongTermPerformanceBasedIncentiveEquityAwardsBasedOnTargetAmountStatedInAgreement" name="MaximumPercentageThatWillUltimatelyVestForSharesProvidedUnderLongTermPerformanceBasedIncentiveEquityAwardsBasedOnTargetAmountStatedInAgreement" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_MaxitMember" name="MaxitMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_May2013SalesLeaseBackAgreementMember" name="May2013SalesLeaseBackAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_MilestoneTwoMember" name="MilestoneTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_MinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpenseDenominator" name="MinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpenseDenominator" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_MinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpenseNumerator" name="MinimumRatioOfEarningsBeforeInterestTaxesDepreciationAndAmortizationToInterestExpenseNumerator" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_MultilevelParkingGarageMember" name="MultilevelParkingGarageMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_NationalSecuritySolutionsMember" name="NationalSecuritySolutionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NatureOfOperationsPolicyTextBlock" name="NatureOfOperationsPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NetIncomeLossFromContinuingOperationAvailableToCommonStockholdersDiluted" name="NetIncomeLossFromContinuingOperationAvailableToCommonStockholdersDiluted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic" name="NetIncomeLossFromContinuingOperationsAvailableToCommonStockholdersBasic" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_NetProceedsPurchasesofCostMethodInvestments" name="NetProceedsPurchasesofCostMethodInvestments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_NoncashorPartNoncashAcquisitionAccountsReceivableForgiven" name="NoncashorPartNoncashAcquisitionAccountsReceivableForgiven" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_NotesWhichMatureOnDecemberTwoThousandFortyMember" name="NotesWhichMatureOnDecemberTwoThousandFortyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_NotesWhichMatureOnDecemberTwoThousandTwentyMember" name="NotesWhichMatureOnDecemberTwoThousandTwentyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_NotesWhichMatureOnJulyTwoThousandThirtyThreeMember" name="NotesWhichMatureOnJulyTwoThousandThirtyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_NotesWhichMatureOnJulyTwoThousandThirtyTwoMember" name="NotesWhichMatureOnJulyTwoThousandThirtyTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_NuclearRegulatoryCommissionMember" name="NuclearRegulatoryCommissionMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NumberOfLawsuits" name="NumberOfLawsuits" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NumberOfMilitaryClinicAndHospitalPatients" name="NumberOfMilitaryClinicAndHospitalPatients" nillable="true" substitutionGroup="xbrli:item" type="xbrli:positiveIntegerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NumberOfPatentsInfringed" name="NumberOfPatentsInfringed" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_NumberofCasesReviewedbytheBoard" name="NumberofCasesReviewedbytheBoard" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NumberofDebtInstruments" name="NumberofDebtInstruments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_NumberofFalseClaims" name="NumberofFalseClaims" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NumberofFormerChiefExecutiveOfficers" name="NumberofFormerChiefExecutiveOfficers" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_NumberofJointVenturePartners" name="NumberofJointVenturePartners" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_NumberofProjects" name="NumberofProjects" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OneCustomerMember" name="OneCustomerMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OpeningMember" name="OpeningMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_OperatingCyclePolicyTextBlock" name="OperatingCyclePolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_OperatingLeaseFromSubcontractorTerm" name="OperatingLeaseFromSubcontractorTerm" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OtherCommitmentsAndContingenciesLineItems" name="OtherCommitmentsAndContingenciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OtherCommitmentsAndContingenciesTable" name="OtherCommitmentsAndContingenciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OtherDisposalsMember" name="OtherDisposalsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OtherFiniteLivedIntangibleAssetsMember" name="OtherFiniteLivedIntangibleAssetsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OtherIncomeNetMember" name="OtherIncomeNetMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_OtherLiabilitiesNoncurrentOther" name="OtherLiabilitiesNoncurrentOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_OtherNoncurrentLiabilitiesAbstract" name="OtherNoncurrentLiabilitiesAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_OutsideDirectorsMember" name="OutsideDirectorsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ParticipantsMaximumPercentageOfEligibleSalaryDefer" name="ParticipantsMaximumPercentageOfEligibleSalaryDefer" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_ParticipatingSecuritiesDistributedAndUndistributedEarningsBasic" name="ParticipatingSecuritiesDistributedAndUndistributedEarningsBasic" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_ParticipatingSecuritiesDistributedAndUndistributedEarningsDiluted" name="ParticipatingSecuritiesDistributedAndUndistributedEarningsDiluted" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_PaymentsforDivestitureofBusiness" name="PaymentsforDivestitureofBusiness" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_PensionAndOtherPostretirementBenefitsDisclosureLineItems" name="PensionAndOtherPostretirementBenefitsDisclosureLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_PensionAndOtherPostretirementBenefitsDisclosureTable" name="PensionAndOtherPostretirementBenefitsDisclosureTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PercentageOfBenefitLikelyOfBeingRealizedUponUltimateSettlement" name="PercentageOfBenefitLikelyOfBeingRealizedUponUltimateSettlement" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PercentageOfMarketPriceDuringNonCompensatoryPeriod" name="PercentageOfMarketPriceDuringNonCompensatoryPeriod" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfMarketPricePerShareForStockPurchaseProgram" name="PercentageOfMarketPricePerShareForStockPurchaseProgram" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfNetProceedsFromLegalSettlementReceivable" name="PercentageOfNetProceedsFromLegalSettlementReceivable" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PercentageOfOwnershipAfterSpinoffTransaction" name="PercentageOfOwnershipAfterSpinoffTransaction" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfStockAwardsVestOrExercisableAfterFourYears" name="PercentageOfStockAwardsVestOrExercisableAfterFourYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfStockAwardsVestOrExercisableAfterOneYear" name="PercentageOfStockAwardsVestOrExercisableAfterOneYear" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfStockAwardsVestOrExercisableAfterThreeYears" name="PercentageOfStockAwardsVestOrExercisableAfterThreeYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfStockAwardsVestOrExercisableAfterTwoYears" name="PercentageOfStockAwardsVestOrExercisableAfterTwoYears" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageOfStockCompensationPlansAwardsVestAfterCertainDate" name="PercentageOfStockCompensationPlansAwardsVestAfterCertainDate" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageofOwnership" name="PercentageofOwnership" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_PercentageofPowertobePurchased" name="PercentageofPowertobePurchased" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_PerformanceBasedRestrictedStockAwardsMember" name="PerformanceBasedRestrictedStockAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PeriodExtensionForPortionsOfIntercompanyLoans" name="PeriodExtensionForPortionsOfIntercompanyLoans" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PeriodForBillingAndCollectionOfUnbilledReceivablesMaximum" name="PeriodForBillingAndCollectionOfUnbilledReceivablesMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PeriodOfCollectionForContractRetentionsMinimum" name="PeriodOfCollectionForContractRetentionsMinimum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PeriodOfExerciseOfVestedOptionsAfterParticipantsDeathOrDisability" name="PeriodOfExerciseOfVestedOptionsAfterParticipantsDeathOrDisability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PeriodOfExtensionForDeferredPaymentTerms" name="PeriodOfExtensionForDeferredPaymentTerms" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_PeriodOfIdentityRestorationServices" name="PeriodOfIdentityRestorationServices" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_PlainfieldRenewalEnergyHoldingsLLCMember" name="PlainfieldRenewalEnergyHoldingsLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_PreSeparationMember" name="PreSeparationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_PreSpinoffMember" name="PreSpinoffMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ProceedsfromRelatedPartyDebtInvestingActivity" name="ProceedsfromRelatedPartyDebtInvestingActivity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_ProceedsfromRepaymentofFinancingCosts" name="ProceedsfromRepaymentofFinancingCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_ProceedsfromRepaymentsofRelatedPartyDebtInvestingActivity" name="ProceedsfromRepaymentsofRelatedPartyDebtInvestingActivity" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_QuarterlyFinancialInformationLineItems" name="QuarterlyFinancialInformationLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_QuarterlyFinancialInformationTable" name="QuarterlyFinancialInformationTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationDenominatorMaximum" name="RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationDenominatorMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationNumeratorMaximum" name="RatioOfConsolidatedFundedDebtToEarningsBeforeInterestTaxesDepreciationAndAmortizationNumeratorMaximum" nillable="true" substitutionGroup="xbrli:item" type="xbrli:decimalItemType" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_ReceivablefromPREHoldingsMember" name="ReceivablefromPREHoldingsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ReconciliationOfIncomeUsedInCalculatingEarningsPerShareTextBlock" name="ReconciliationOfIncomeUsedInCalculatingEarningsPerShareTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_RemainingTermofCapitalLease" name="RemainingTermofCapitalLease" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ResearchandDevelopmentSolutionsLLCMember" name="ResearchandDevelopmentSolutionsLLCMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_RestrictedCashPolicyTextBlock" name="RestrictedCashPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_RestructuringChargesIncludingSeparationChargesNetofTax" name="RestructuringChargesIncludingSeparationChargesNetofTax" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_RestructuringChargesIncludingSeparationCosts" name="RestructuringChargesIncludingSeparationCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_RestructuringRelatedIncomeTaxBenefit" name="RestructuringRelatedIncomeTaxBenefit" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_RevealImagingTechnologiesInc.Member" name="RevealImagingTechnologiesInc.Member" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_RevolvingCreditFacilityExtendedMaturityPeriod" name="RevolvingCreditFacilityExtendedMaturityPeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_SAICMember" name="SAICMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_SAICSeparationAdjustmentMember" name="SAICSeparationAdjustmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SalariesBonusesAndAmountsWithheldFromEmployeesCompensation" name="SalariesBonusesAndAmountsWithheldFromEmployeesCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="ldos_SaleLeasebackTransactionNumberofBuildingsLeasedBack" name="SaleLeasebackTransactionNumberofBuildingsLeasedBack" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SaleofPropertyPeriodtoCompleteTransaction" name="SaleofPropertyPeriodtoCompleteTransaction" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SalesandLeasebackTransactionNumberofBuildingsSold" name="SalesandLeasebackTransactionNumberofBuildingsSold" nillable="true" substitutionGroup="xbrli:item" type="xbrli:integerItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ScheduleOfCertainFinancialStatementCaptionsTextBlock" name="ScheduleOfCertainFinancialStatementCaptionsTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ScheduleOfClassifiedDeferredTaxAssetsAndLiabilitiesTableTextBlock" name="ScheduleOfClassifiedDeferredTaxAssetsAndLiabilitiesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems" name="ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable" name="ScheduleOfEarningsPerShareBasicAndDilutedByCommonClassTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ScheduleOfShareBasedCompensationActivityRelatedToExerciseOfStockOptionsTableTextBlock" name="ScheduleOfShareBasedCompensationActivityRelatedToExerciseOfStockOptionsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ScheduleOfShareBasedCompensationAndRelatedTaxBenefitsRecognizedTableTextBlock" name="ScheduleOfShareBasedCompensationAndRelatedTaxBenefitsRecognizedTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ScheduleOfWeightedAverageNumberOfSharesOutstandingTable" name="ScheduleOfWeightedAverageNumberOfSharesOutstandingTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ScheduleofDetailsofPurchasePriceTextBlock" name="ScheduleofDetailsofPurchasePriceTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_SecuritiesClassActionsMember" name="SecuritiesClassActionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SegmentsMajorCustomersExplanatoryTableTextBlock" name="SegmentsMajorCustomersExplanatoryTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriodWeightedAverageFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdjustmentForSpecialCashDividend" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdjustmentForSpecialCashDividend" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm2" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm2" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSeparationAdjustment" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSeparationAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSeparationAgreementWeightedAverageGrantDateFairValue" name="SharebasedCompensationArrangementbySharebasedPaymentAwardEquityInstrumentsOtherthanOptionsSeparationAgreementWeightedAverageGrantDateFairValue" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodWeightedAverageGrantDateFairValueModification" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsGrantsinPeriodWeightedAverageGrantDateFairValueModification" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSeparationAdjustments" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSeparationAdjustments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSeparationAgreementWeightedAverageExercisePrice" name="SharebasedCompensationArrangementbySharebasedPaymentAwardOptionsSeparationAgreementWeightedAverageExercisePrice" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_SignificantAccountingPoliciesLineItems" name="SignificantAccountingPoliciesLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_SignificantAccountingPoliciesTable" name="SignificantAccountingPoliciesTable" nillable="true" substitutionGroup="xbrldt:hypercubeItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_SpecialDividend" name="SpecialDividend" nillable="true" substitutionGroup="xbrli:item" type="num:perShareItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_SpecialDividendPaid" name="SpecialDividendPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_SpecialDividendPolicyTextBlock" name="SpecialDividendPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_StockAwardsExercisablePeriod" name="StockAwardsExercisablePeriod" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_StockBasedCompensationVestingInterestEachYear" name="StockBasedCompensationVestingInterestEachYear" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_StockCancelledToCoverPriceOfOptionsExercises" name="StockCancelledToCoverPriceOfOptionsExercises" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_StockConversionUponDivestiture" name="StockConversionUponDivestiture" nillable="true" substitutionGroup="xbrli:item" type="xbrli:pureItemType" xbrli:periodType="instant" />
  <xsd:element id="ldos_StockIssuedInLieuofCashDividend" name="StockIssuedInLieuofCashDividend" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="ldos_StockIssuedVestedStockIssuedAsSettlementOfAnnualBonusAccruals" name="StockIssuedVestedStockIssuedAsSettlementOfAnnualBonusAccruals" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_StockOptionsAxis" name="StockOptionsAxis" nillable="true" substitutionGroup="xbrldt:dimensionItem" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_StockOptionsDomain" name="StockOptionsDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_StockSplitMember" name="StockSplitMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_StockholderDerivativeCasesMember" name="StockholderDerivativeCasesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_StrategicAdvisoryServicesExpense" name="StrategicAdvisoryServicesExpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_SuretyBondsAmountOutstanding" name="SuretyBondsAmountOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_SurfaceParkingLotsMember" name="SurfaceParkingLotsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_TaxAdjustmentsSettlementsandUnusualProvisionsDividendPaidtoEmployeeoftheNewCompany" name="TaxAdjustmentsSettlementsandUnusualProvisionsDividendPaidtoEmployeeoftheNewCompany" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_TaxAdjustmentsSettlementsandUnusualProvisionsSpecialDividend" name="TaxAdjustmentsSettlementsandUnusualProvisionsSpecialDividend" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
  <xsd:element id="ldos_TaxCreditCarryforwardsExpirationDate1" name="TaxCreditCarryforwardsExpirationDate1" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_TermofAgreement" name="TermofAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_ThirdPartyCreditEnhancementAmount" name="ThirdPartyCreditEnhancementAmount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="ldos_TimeKeepingContractWithCityOfNewYorkMember" name="TimeKeepingContractWithCityOfNewYorkMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_TwoCustomersMember" name="TwoCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_TwoThousandSixEquityIncentivePlanMember" name="TwoThousandSixEquityIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_USArmyMember" name="USArmyMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_USDoDMember" name="USDoDMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_USGovernmentMember" name="USGovernmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsAndSettlementsWithTaxAuthorities" name="UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositionsAndSettlementsWithTaxAuthorities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_ValueAddedTaxesMember" name="ValueAddedTaxesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_VestedStockAwardsMember" name="VestedStockAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_VestingStockAwardsMember" name="VestingStockAwardsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_VirnetXIncMember" name="VirnetXIncMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_VitalizeandmaxITMember" name="VitalizeandmaxITMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="ldos_WeightedAverageNumberOfSharesOutstandingLineItems" name="WeightedAverageNumberOfSharesOutstandingLineItems" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element id="ldos_WriteoffofDeferredDebtIssuanceCostAndDebtDiscount" name="WriteoffofDeferredDebtIssuanceCostAndDebtDiscount" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
</xsd:schema>
