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    <link:loc xlink:href="mrcy-20160331.xsd#mrcy_EmployeeStockPurchasePlanMaximumPercentageOfCompensationToPurchaseSharesByEligibleParticipants" xlink:label="loc_mrcy_EmployeeStockPurchasePlanMaximumPercentageOfCompensationToPurchaseSharesByEligibleParticipants_924BAE54C06CBE9FC81F7A2D7FA55FD4" xlink:type="locator" />
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    <link:label id="lab_mrcy_LockheedMartinCorporationMember_BE7D7A2302226B8A31B34ED090B3AC4C_terseLabel_en-US" xlink:label="lab_mrcy_LockheedMartinCorporationMember_BE7D7A2302226B8A31B34ED090B3AC4C" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Lockheed Martin Corporation [Member]</link:label>
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    <link:label id="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_11F0C33632DA7107E90D7A2D82198A06_terseLabel_en-US" xlink:label="lab_us-gaap_DeferredIncomeTaxExpenseBenefit_11F0C33632DA7107E90D7A2D82198A06" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Benefit for deferred income taxes</link:label>
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    <link:label id="lab_us-gaap_GoodwillAndIntangibleAssetImpairment_19E1010C98269EA31DF47A2D8219FB56_terseLabel_en-US" xlink:label="lab_us-gaap_GoodwillAndIntangibleAssetImpairment_19E1010C98269EA31DF47A2D8219FB56" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Impairment of goodwill and long-lived assets</link:label>
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    <link:label id="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_C4658582BD9144CC60247A2D821C3636_terseLabel_en-US" xlink:label="lab_us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable_C4658582BD9144CC60247A2D821C3636" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xlink:type="resource" xml:lang="en-US">Income taxes payable</link:label>
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