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    <link:label id="lab_us-gaap_RangeMember_E3BC75C9F1DAAEE1C1062990B9BCB449_label_en-US" xlink:label="lab_us-gaap_RangeMember_E3BC75C9F1DAAEE1C1062990B9BCB449" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Range [Domain]</link:label>
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    <link:label id="lab_us-gaap_MinimumMember_023F591BE3A38562F73A2990B9BCD8A0_label_en-US" xlink:label="lab_us-gaap_MinimumMember_023F591BE3A38562F73A2990B9BCD8A0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Minimum [Member]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_MinimumMember" xlink:label="loc_us-gaap_MinimumMember_023F591BE3A38562F73A2990B9BCD8A0" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized" xlink:label="loc_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized_237527A26EDD0B633AC42990B9BC377C" xlink:type="locator" />
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    <link:label id="lab_mrcy_MinimumGrantDateFairValueOfNonqualifiedStockOptionsAsPercentageOfFairValueOfCommonStock_1753DBCF4F51E58885532990B9BCB9AC_terseLabel_en-US" xlink:label="lab_mrcy_MinimumGrantDateFairValueOfNonqualifiedStockOptionsAsPercentageOfFairValueOfCommonStock_1753DBCF4F51E58885532990B9BCB9AC" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Exercise price of stock option, percentage</link:label>
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    <link:loc xlink:href="mrcy-20130930.xsd#mrcy_MinimumGrantDateFairValueOfNonqualifiedStockOptionsAsPercentageOfFairValueOfCommonStock" xlink:label="loc_mrcy_MinimumGrantDateFairValueOfNonqualifiedStockOptionsAsPercentageOfFairValueOfCommonStock_1753DBCF4F51E58885532990B9BCB9AC" xlink:type="locator" />
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    <link:label id="lab_mrcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardContractualLife_8D8599721690C60C27EA2990B9BD5753_terseLabel_en-US" xlink:label="lab_mrcy_ShareBasedCompensationArrangementByShareBasedPaymentAwardContractualLife_8D8599721690C60C27EA2990B9BD5753" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Term of stock option</link:label>
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    <link:label id="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_087C118778CFA3826A472990B9BDFAE4_terseLabel_en-US" xlink:label="lab_us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant_087C118778CFA3826A472990B9BDFAE4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Shares available for future grant</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_C8E383B7B4FC3DFFF48A29CD52AE1573_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInOtherNoncurrentLiabilities_C8E383B7B4FC3DFFF48A29CD52AE1573" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Other non-current liabilities</link:label>
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash provided by (used in) operating activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Operating Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInOperatingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5" xlink:to="lab_us-gaap_NetCashProvidedByUsedInOperatingActivities_C4483C28791F15C41F1D29CD52AEB6C5" xlink:type="arc" />
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_EFC8AC887BA439680ABD29CD52AE664E_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivitiesAbstract_EFC8AC887BA439680ABD29CD52AE664E" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from investing activities:</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6A318A08A53DA2D0A7F529CD52AE01A9_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired_6A318A08A53DA2D0A7F529CD52AE01A9" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Acquisition of businesses, net of cash acquired</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_576E2C9A841F9ED0877129CD52AEA886_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_576E2C9A841F9ED0877129CD52AEA886" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Purchases of property and equipment</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_PaymentsToAcquirePropertyPlantAndEquipment" xlink:label="loc_us-gaap_PaymentsToAcquirePropertyPlantAndEquipment_576E2C9A841F9ED0877129CD52AEA886" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_701E1171E30619E5F9DF29CD52AED0CE_totalLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_701E1171E30619E5F9DF29CD52AED0CE" xlink:role="http://www.xbrl.org/2003/role/totalLabel" xlink:type="resource" xml:lang="en-US">Net cash used in investing activities</link:label>
    <link:label id="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_701E1171E30619E5F9DF29CD52AED0CE_label_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInInvestingActivities_701E1171E30619E5F9DF29CD52AED0CE" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Net Cash Provided by (Used in) Investing Activities</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInInvestingActivities" xlink:label="loc_us-gaap_NetCashProvidedByUsedInInvestingActivities_701E1171E30619E5F9DF29CD52AED0CE" xlink:type="locator" />
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    <link:label id="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_63D391E9D74B2451771729CD52AEAFC5_terseLabel_en-US" xlink:label="lab_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_63D391E9D74B2451771729CD52AEAFC5" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Cash flows from financing activities:</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract" xlink:label="loc_us-gaap_NetCashProvidedByUsedInFinancingActivitiesAbstract_63D391E9D74B2451771729CD52AEAFC5" xlink:type="locator" />
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    <link:label id="lab_us-gaap_ProceedsFromStockOptionsExercised_89142F36615D4AA4CBB029CD52AFED72_terseLabel_en-US" xlink:label="lab_us-gaap_ProceedsFromStockOptionsExercised_89142F36615D4AA4CBB029CD52AFED72" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Proceeds from employee stock plans</link:label>
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    <link:label id="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_7994F518DC7C409013C129CD52AF5171_terseLabel_en-US" xlink:label="lab_us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities_7994F518DC7C409013C129CD52AF5171" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Excess tax benefits from stock-based compensation</link:label>
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    <link:label id="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_63AFF3B7F1D680FE241A29CD52AF1ECB_negatedLabel_en-US" xlink:label="lab_us-gaap_PaymentsToAcquireAvailableForSaleSecuritiesDebt_63AFF3B7F1D680FE241A29CD52AF1ECB" xlink:role="http://www.xbrl.org/2009/role/negatedLabel" xlink:type="resource" xml:lang="en-US">Payments of acquired debt</link:label>
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable" xlink:label="loc_us-gaap_ScheduleOfEntityWideRevenueByMajorCustomersByReportingSegmentsTable_7FA1814C87DC8AC2D52E14A8C637CDD6" xlink:type="locator" />
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    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_StatementBusinessSegmentsAxis" xlink:label="loc_us-gaap_StatementBusinessSegmentsAxis_67C2FAF9CFE0EF38D8AE14A8C63898F6" xlink:type="locator" />
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    <link:label id="lab_us-gaap_SegmentDomain_6FC2C6B3630048FA716314A8C638697A_terseLabel_en-US" xlink:label="lab_us-gaap_SegmentDomain_6FC2C6B3630048FA716314A8C638697A" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Segment [Domain]</link:label>
    <link:label id="lab_us-gaap_SegmentDomain_6FC2C6B3630048FA716314A8C638697A_label_en-US" xlink:label="lab_us-gaap_SegmentDomain_6FC2C6B3630048FA716314A8C638697A" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Segment [Domain]</link:label>
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    <link:label id="lab_mrcy_MercuryCommercialElectronicsMember_A7233D93A9C81E14820014A8C6383B32_terseLabel_en-US" xlink:label="lab_mrcy_MercuryCommercialElectronicsMember_A7233D93A9C81E14820014A8C6383B32" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">MCE</link:label>
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    <link:loc xlink:href="mrcy-20130930.xsd#mrcy_MercuryCommercialElectronicsMember" xlink:label="loc_mrcy_MercuryCommercialElectronicsMember_A7233D93A9C81E14820014A8C6383B32" xlink:type="locator" />
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    <link:label id="lab_us-gaap_MajorCustomersAxis_3DABFD91A37423D9AFC014A8C6385667_terseLabel_en-US" xlink:label="lab_us-gaap_MajorCustomersAxis_3DABFD91A37423D9AFC014A8C6385667" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Major Customers</link:label>
    <link:label id="lab_us-gaap_MajorCustomersAxis_3DABFD91A37423D9AFC014A8C6385667_label_en-US" xlink:label="lab_us-gaap_MajorCustomersAxis_3DABFD91A37423D9AFC014A8C6385667" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Major Customers [Axis]</link:label>
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    <link:label id="lab_us-gaap_NameOfMajorCustomerDomain_6306BA6CB53B98CD006114A8C638D4A3_terseLabel_en-US" xlink:label="lab_us-gaap_NameOfMajorCustomerDomain_6306BA6CB53B98CD006114A8C638D4A3" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Name of Major Customer [Domain]</link:label>
    <link:label id="lab_us-gaap_NameOfMajorCustomerDomain_6306BA6CB53B98CD006114A8C638D4A3_label_en-US" xlink:label="lab_us-gaap_NameOfMajorCustomerDomain_6306BA6CB53B98CD006114A8C638D4A3" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Name of Major Customer [Domain]</link:label>
    <link:loc xlink:href="http://xbrl.fasb.org/us-gaap/2012/elts/us-gaap-2012-01-31.xsd#us-gaap_NameOfMajorCustomerDomain" xlink:label="loc_us-gaap_NameOfMajorCustomerDomain_6306BA6CB53B98CD006114A8C638D4A3" xlink:type="locator" />
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    <link:label id="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7_terseLabel_en-US" xlink:label="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Northrop Grumman Corporation</link:label>
    <link:label id="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7_label_en-US" xlink:label="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer One [Member]</link:label>
    <link:label id="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7_documentation_en-US" xlink:label="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Customer 1 [Member]</link:label>
    <link:loc xlink:href="mrcy-20130930.xsd#mrcy_CustomerOneMember" xlink:label="loc_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7" xlink:to="lab_mrcy_CustomerOneMember_2FBB73F4899FCCB9695114A8C63846F7" xlink:type="arc" />
    <link:label id="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0_terseLabel_en-US" xlink:label="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Raytheon Company</link:label>
    <link:label id="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0_label_en-US" xlink:label="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Two [Member]</link:label>
    <link:label id="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0_documentation_en-US" xlink:label="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Customer 2 [Member]</link:label>
    <link:loc xlink:href="mrcy-20130930.xsd#mrcy_CustomerTwoMember" xlink:label="loc_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0" xlink:to="lab_mrcy_CustomerTwoMember_BBCA6A4AD6B132C78F2D14A8C638BDC0" xlink:type="arc" />
    <link:label id="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B_terseLabel_en-US" xlink:label="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lockheed Martin Corporation</link:label>
    <link:label id="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B_label_en-US" xlink:label="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B" xlink:role="http://www.xbrl.org/2003/role/label" xlink:type="resource" xml:lang="en-US">Customer Three [Member]</link:label>
    <link:label id="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B_documentation_en-US" xlink:label="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B" xlink:role="http://www.xbrl.org/2003/role/documentation" xlink:type="resource" xml:lang="en-US">Customer 3 [Member]</link:label>
    <link:loc xlink:href="mrcy-20130930.xsd#mrcy_CustomerThreeMember" xlink:label="loc_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B" xlink:type="locator" />
    <link:labelArc order="1" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B" xlink:to="lab_mrcy_CustomerThreeMember_9DB103D09CE3AD8ECE7314A8C6386C3B" xlink:type="arc" />
    <link:label id="lab_mrcy_Customer4Domain_2DDA5FEFFB2E550F8AAA14A8C63868A4_terseLabel_en-US" xlink:label="lab_mrcy_Customer4Domain_2DDA5FEFFB2E550F8AAA14A8C63868A4" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">BAE Systems PLC</link:label>
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    <link:loc xlink:href="mrcy-20130930.xsd#mrcy_Customer4Domain" xlink:label="loc_mrcy_Customer4Domain_2DDA5FEFFB2E550F8AAA14A8C63868A4" xlink:type="locator" />
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    <link:label id="lab_mrcy_MercuryDefenseAndIntelligenceSystemsMember_B358B488B5E3E86DE35111103D5E1924_terseLabel_en-US" xlink:label="lab_mrcy_MercuryDefenseAndIntelligenceSystemsMember_B358B488B5E3E86DE35111103D5E1924" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Mercury Defense and Intelligence Systems</link:label>
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