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  <xsd:element id="noc_ProFormaAdjustmentsOrbitalATKintercompanysaleselimination" name="ProFormaAdjustmentsOrbitalATKintercompanysaleselimination" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration" />
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  <xsd:element id="noc_ResearchandDevelopmentasaPercentofSales" name="ResearchandDevelopmentasaPercentofSales" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
  <xsd:element id="noc_ScheduleofUnbilledReceivablesTableTextBlock" name="ScheduleofUnbilledReceivablesTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element id="noc_SegmentReportingInformationIntersegmentSalesAndOperatingIncomeTableTextBlock" name="SegmentReportingInformationIntersegmentSalesAndOperatingIncomeTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_September2015ShareRepurchaseOriginalAuthorizationMember" name="September2015ShareRepurchaseOriginalAuthorizationMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="noc_ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardGrantsPercentageFinancialMetricMetExceeded" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardGrantsPercentageFinancialMetricMetExceeded" nillable="true" substitutionGroup="xbrli:item" type="num:percentItemType" xbrli:periodType="duration" />
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  <xsd:element id="noc_StandbyUnusedLettersOfCreditandbankguarantees" name="StandbyUnusedLettersOfCreditandbankguarantees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="noc_StockIssuedDuringPeriodFairValueGrantDateShareBasedCompensation" name="StockIssuedDuringPeriodFairValueGrantDateShareBasedCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="noc_SuretyBondOutstanding" name="SuretyBondOutstanding" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element abstract="true" id="noc_TechnologyServicesMember" name="TechnologyServicesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="noc_TwoThousandFortyThreeMember" name="TwoThousandFortyThreeMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="noc_TwoThousandTwentyEightMember" name="TwoThousandTwentyEightMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
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  <xsd:element abstract="true" id="noc_TwoThousandTwentyTwoMember" name="TwoThousandTwentyTwoMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_TwoYearTermMemberDomain" name="TwoYearTermMemberDomain" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_U.S.EquitySecuritiesMember" name="U.S.EquitySecuritiesMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_USGovernmentMember" name="USGovernmentMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="noc_UnamortizedbenefitplancostsTaxBenefitexpense" name="UnamortizedbenefitplancostsTaxBenefitexpense" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant" />
  <xsd:element id="noc_UnbilledContractReceivablenetofprogressandperformancebasedpayments" name="UnbilledContractReceivablenetofprogressandperformancebasedpayments" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant" />
  <xsd:element id="noc_UnbilledReceivablesDisclosureTextBlock" name="UnbilledReceivablesDisclosureTextBlock" nillable="true" substitutionGroup="xbrli:item" type="nonnum:textBlockItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_UnbilledReceivablesNetAbstract" name="UnbilledReceivablesNetAbstract" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_UnitedStatesPostalServiceMember" name="UnitedStatesPostalServiceMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_UnpaidPortionsOfContractPriceAndDirectCostsIncurredMember" name="UnpaidPortionsOfContractPriceAndDirectCostsIncurredMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
  <xsd:element id="noc_UnrecognizedTaxBenefitsIncreaseresultingfrom2017TaxAct" name="UnrecognizedTaxBenefitsIncreaseresultingfrom2017TaxAct" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element id="noc_UnrecognizedTaxBenefitsOther" name="UnrecognizedTaxBenefitsOther" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration" />
  <xsd:element abstract="true" id="noc_VoluntaryContributionsMember" name="VoluntaryContributionsMember" nillable="true" substitutionGroup="xbrli:item" type="nonnum:domainItemType" xbrli:periodType="duration" />
</xsd:schema>
