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        <PersonNm>KIMBERLY WARREN</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DOUGLAS P ROBBINS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GREGORY CRAWFORD</PersonNm>
        <TitleTxt>VP, JOINT AND SERVICES CENTER</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>YOSRY A BARSOUM</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>JAMES E COOK</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>EILEEN M BOETTCHER</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>JULIE GRAVALLESE</PersonNm>
        <TitleTxt>VP, PROGRMS &amp; TECH INTEGRATION</TitleTxt>
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        <PersonNm>DR ELIAHU H NIEWOOD</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>STEPHANIE E TURNER</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>CHRISTINA ORFANOS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>WEN MASTERS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>MARC L SALIT</PersonNm>
        <TitleTxt>MITRE FELLOW</TitleTxt>
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        <PersonNm>DR JULIE DELVECCHIO</PersonNm>
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        <PersonNm>STEVEN J KIRIN</PersonNm>
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        <PersonNm>NATHAN HOLZRICHTER</PersonNm>
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        <PersonNm>CARL G BUCY</PersonNm>
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        <PersonNm>DR GERALD N GILBERT</PersonNm>
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        <PersonNm>MARIN S HALPER</PersonNm>
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        <PersonNm>CHRISTOPHER FALL</PersonNm>
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        <PersonNm>GREGG A LEONE</PersonNm>
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        <PersonNm>CHARLES PETER LEROY</PersonNm>
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        <PersonNm>CEDRIC SIMS</PersonNm>
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        <PersonNm>AUSTIN YU-CHUNG WANG</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>MICHAEL J ROGERS</PersonNm>
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        <PersonNm>CATHY MINEHAN</PersonNm>
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        <PersonNm>GEORGE CAMPBELL JR</PersonNm>
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        <PersonNm>NICHOLAS DONOFRIO</PersonNm>
        <TitleTxt>TRUSTEE (UNTIL 11/3/22)</TitleTxt>
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        <PersonNm>RODNEY EARL SLATER</PersonNm>
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        <PersonNm>PAUL KAMINSKI</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ADALIO SANCHEZ</PersonNm>
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        <PersonNm>JAN TIGHE</PersonNm>
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        <PersonNm>GEORGE HALVORSON</PersonNm>
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        <PersonNm>LANCE COLLINS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>YVETTE MELENDEZ</PersonNm>
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        <PersonNm>JOHN NOSEWORTHY</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SUSAN GORDON</PersonNm>
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        <PersonNm>MAURY BRADSHER</PersonNm>
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      <CompensationFromOtherSrcsInd>false</CompensationFromOtherSrcsInd>
      <ContractorCompensationGrp>
        <ContractorName>
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          <USAddress>
            <AddressLine1Txt>1290 AVENUE OF THE AMERICAS</AddressLine1Txt>
            <CityNm>NEW YORK</CityNm>
            <StateAbbreviationCd>NY</StateAbbreviationCd>
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          </USAddress>
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        <ExplanationTxt>UNDER PROVISIONS OF THE U.S. INTERNAL REVENUE CODE SECTION 501(C)(3), THE CORPORATION IS EXEMPT FROM TAXES ON INCOME OTHER THAN UNRELATED BUSINESS INCOME. FOR THE YEAR ENDED DECEMBER 31, 2022, THE CORPORATION HAD NO UNRELATED TAXABLE BUSINESS INCOME AND, THEREFORE, NO PROVISION FOR INCOME TAXES WAS MADE. THE CORPORATION TAKES NO TAX POSITIONS WHICH IT CONSIDERS TO BE UNCERTAIN.</ExplanationTxt>
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        <PersonNm>CHRISTINA ORFANOS</PersonNm>
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        <TotalCompensationFilingOrgAmt>578416</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <PersonNm>WEN MASTERS</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <PersonNm>STEVEN J KIRIN</PersonNm>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <PersonNm>CHARLES PETER LEROY</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>GREGG A LEONE</PersonNm>
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        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
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        <PersonNm>AUSTIN YU-CHUNG WANG</PersonNm>
        <TitleTxt>VICE PRESIDENT</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>1327</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>70751</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>FIRST-CLASS OR CHARTER TRAVEL: TRUSTEES (INCLUDING HONORARY TRUSTEES) ARE REIMBURSED FOR THEIR ACTUAL TRAVEL EXPENSE. TRAVEL BY AIR IS REIMBURSED UP TO ONE CLASS ABOVE COACH WHERE THE PUBLISHED TOTAL FLIGHT TIME EXCEEDS TWO HOURS. TRAVEL FOR COMPANIONS: TRAVEL BY SPOUSES OF TRUSTEES AND OFFICERS IS REIMBURSED IN CONNECTION WITH TRAVEL TO ONE BOARD MEETING PER YEAR, THE PARTICULAR MEETING TO BE AT THE RECIPIENT'S DISCRETION. THE REIMBURSED AMOUNT IS TAXABLE TO THE RESPECTIVE TRUSTEES AND OFFICERS. THERE IS NO TRAVEL EXPENSE REIMBURSEMENT FOR THE SPOUSES OF HONORARY TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINES 4A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOLLOWING INDIVIDUALS RECEIVED A SEVERANCE PAYMENTS: JEROME HOGGE III $1,025,127 EILEEN M BOETTCHER $243,364 CHARLES PETER LEROY $279,231</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICER COMPENSATION MAY INCLUDE AN "INCENTIVE" COMPONENT. WHETHER AND HOW MUCH INCENTIVE TO PAY IS WITHIN THE BOARD'S DISCRETION, SUBJECT TO PREDETERMINED (BY THE BOARD) LIMITS. THE COMPENSATION COMMITTEE RECOMMENDS INCENTIVE AMOUNTS BASED ON PREDETERMINED PERFORMANCE CRITERIA AND CONSULTATION WITH THE CEO. DETERMINATION OF THE CEO'S INCENTIVE IS MADE BY THE COMPENSATION COMMITTEE IN COLLABORATION WITH THE BOARD'S EXECUTIVE COMMITTEE. THE CEO DOES NOT PARTICIPATE IN BOARD DISCUSSIONS RELATIVE TO HIS INCENTIVE.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
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      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>JAMES F PROVIDAKES</PersonNm>
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        <RelationshipDescriptionTxt>BROTHER OF OFFICER</RelationshipDescriptionTxt>
        <TransactionAmt>317400</TransactionAmt>
        <TransactionDesc>EMPLOYMENT</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>ERIC PROVIDAKES</PersonNm>
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        <RelationshipDescriptionTxt>SON OF OFFICER</RelationshipDescriptionTxt>
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    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>UNDER MITRE'S BYLAWS, THE BOARD'S EXECUTIVE COMMITTEE IS AUTHORIZED TO EXERCISE ALL POWERS VESTED IN THE BOARD OF TRUSTEES DURING THE INTERVALS BETWEEN MEETINGS OF THE BOARD. MEMBERSHIP ON THE EXECUTIVE COMMITTEE IS DRAWN EXCLUSIVELY FROM THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>GEORGE CAMPBELL AND NICHOLAS DONOFRIO SHARED SERVICE ON OTHER COMPANIES' BOARDS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B:</FormAndLineReferenceDesc>
        <ExplanationTxt>A DRAFT OF THE COMPLETED FORM 990 IS REVIEWED BY THE BOARD'S AUDIT COMMITTEE AND BY THE ORGANIZATION'S CHIEF FINANCIAL OFFICER AND SENIOR TAX MANAGER. A DRAFT OF PART VI OF THE FORM IS REVIEWED BY THE BOARD'S TRUSTEESHIP COMMITTEE. A FINAL DRAFT OF THE FORM IS DISTRIBUTED TO ALL MEMBERS OF THE ORGANIZATION'S GOVERNING BODY PRIOR TO ELECTRONIC FILING WITH THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C:</FormAndLineReferenceDesc>
        <ExplanationTxt>TRUSTEES ANNUALLY SUBMIT IN WRITING FORMAL DISCLOSURE OF THEIR AFFILIATIONS AND OUTSIDE BUSINESS INTERESTS, INCLUDING SUBSTANTIAL FINANCIAL HOLDINGS. THE DISCLOSURES ARE REVIEWED BY THE ORGANIZATION'S GENERAL COUNSEL AND BY THE BOARD'S GOVERNANCE &amp; BOARD DEVELOPMENT COMMITTEE. IN THE EVENT THAT A POTENTIAL FOR CONFLICT IS DETECTED, THE GENERAL COUNSEL AND/OR TRUSTEESHIP COMMITTEE WILL SEEK TO RESOLVE THE CONFLICT DIRECTLY WITH THE TRUSTEE. THE AFFECTED TRUSTEE MAY BE ASKED TO RECUSE HIM/HERSELF FROM PARTICIPATION IN DISCUSSIONS OR DECISION MAKING THAT MAY SUGGEST A CONFLICT. TO PROVIDE COMPLETE TRANSPARENCY AND TO ENGAGE THE BOARD MORE DIRECTLY IN THE ASSESSMENT AND RESOLUTION OF POTENTIAL CONFLICTS OR THE APPEARANCE OF CONFLICT, TRUSTEE DISCLOSURES ARE CIRCULATED TO ALL MEMBERS OF MITRE'S GOVERNING BODY FOR THEIR REVIEW AND REFERENCE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15:</FormAndLineReferenceDesc>
        <ExplanationTxt>OFFICER COMPENSATION IS APPROVED ANNUALLY BY THE ORGANIZATION'S GOVERNING BOARD BASED ON THE RECOMMENDATIONS OF ITS COMPENSATION COMMITTEE, WHICH IS COMPRISED OF FIVE INDEPENDENT TRUSTEES. THE COMMITTEE REVIEWS THE TOTAL COMPENSATION AND BENEFITS PACKAGES OF MITRE OFFICERS AND RECOMMENDS APPROPRIATE ADJUSTMENTS TO THE BOARD OF TRUSTEES IN CONSULTATION WITH MITRE CHIEF EXECUTIVE OFFICER. PRIOR TO MAKING ITS RECOMMENDATIONS, THE COMMITTEE CONSIDERS AND INTEGRATES MARKET FACTORS, AS WELL AS THE REASONABLENESS OF ACTIONS IN RELATION TO THE OVERALL ENVIRONMENT. THE COMMITTEE HAS DISCRETION TO RETAIN THE ASSISTANCE OF EXTERNAL CONSULTANTS WITH RESPECT TO THE MARKET COMPETITIVENESS OF MITRE'S OFFICER PAY LEVELS AND POLICIES. THE BOARD OF TRUSTEES HAS SOLE DISCRETION TO FINALIZE OFFICER PAY LEVELS, CONSIDERING THE RECOMMENDATIONS OF THE COMPENSATION COMMITTEE, ITS EXTERNAL CONSULTANTS, AND ANY OTHER FACTORS THEY DEEM RELEVANT. THE BOARD OF TRUSTEES, WITH THE RECOMMENDATIONS OF THE COMPENSATION COMMITTEE EVALUATES CEO PERFORMANCE AND COORDINATES WITH THE BOARD'S COMPENSATION COMMITTEE ON A RECOMMENDED CEO COMPENSATION PACKAGE. CONSISTENT WITH THE PROCESS APPLICABLE TO ALL OFFICERS, THE FULL BOARD OFV TRUSTEES REVIEWS, DISCUSSES AND VOTES WHETHER TO APPROVE OR MODIFY THE COMPENSATION COMMITTEE'S RECOMMENDATIONS FOR CEO COMPENSATION. THE CEO DOES NOT PARTICIPATE IN EITHER THE COMMITTEE'S OR THE BOARD'S DISCUSSIONS OR DECISION MAKING PERTINENT TO HIS COMPENSATION. THE ABOVE-DESCRIBED PROCESS IS PERFORMED ANNUALLY. IT WAS LAST APPLIED TO EACH OFFICER IN SEPTEMBER-NOVEMBER 2022.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19:</FormAndLineReferenceDesc>
        <ExplanationTxt>MITRE MAKES ITS GOVERNING DOCUMENTS AVAILABLE TO THE PUBLIC ON REQUEST. MITRE DOES NOT MAKE AVAILABLE TO THE GENERAL PUBLIC ITS CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VIII, LINE 1E (SCHEDULE A, PART II; SCHEDULE B, PART I)</FormAndLineReferenceDesc>
        <ExplanationTxt>MITRE OPERATES SEVERAL FEDERALLY FUNDED RESEARCH AND DEVELOPMENT CENTERS (FFRDCS) SPONSORED BY THE UNITED STATES GOVERNMENT. THROUGH THE FFRDCS, MITRE ACHIEVES ITS TAX-EXEMPT PURPOSE BY PERFORMING ON CONTRACTS THAT ARE EITHER FOR THE U.S. GOVERNMENT OR ARE APPROVED BY THE U.S. GOVERNMENT. AN FFRDC IS DESIGNED TO PERFORM ON PROJECTS INVOLVING RESEARCH THAT EXCEEDS NORMAL CAPABILITIES, WHILE OPERATING IN THE PUBLIC INTEREST. AS THE MISSION OF THE U.S. GOVERNMENT SPONSOR IS TO SERVE THE PUBLIC INTEREST, AND AS THE FFRDC IS STRUCTURED TO PROVIDE SERVICES THAT ARE INTEGRAL TO THE MISSION OF THE SPONSOR, THE FFRDC IS DESIGNED TO PROVIDE SERVICES IN THE PUBLIC INTEREST. ACCORDINGLY, BECAUSE THE CONTRACTS ON WHICH MITRE PERFORMS BENEFIT THE PUBLIC MORE THAN A PARTICULAR GOVERNMENT AGENCY, THE REVENUE RELATED TO THE CONTRACTS IS REPORTED AS CONTRIBUTIONS, OR GOVERNMENT GRANTS, ON PART VIII, LINE 1E, INSTEAD OF AS PROGRAM SERVICE REVENUE ON LINE 2 OF PART VIII. MITRE'S TAX-EXEMPTION FALLS UNDER IRC SECTION 509(A)(2). AS SUCH, THE ORGANIZATION HAS CHECKED BOX 10 IN PART I OF SCHEDULE A, AND HAS COMPLETED PART III OF SCHEDULE A. HOWEVER, AS MITRE'S CONTRACT RELATED REVENUE QUALIFIES AS CONTRIBUTIONS OR GRANTS, MITRE SATISFIES THE REQUIREMENTS OF IRC SECTIONS 509(A)(1) AND 170(B)(1)(A)(VI), AND MAINTAINS FILE DOCUMENTATION OF A COMPLETED PART II OF SCHEDULE A. ACCORDINGLY, THE CONTRIBUTORS REPORTED IN PART I OF SCHEDULE B REFLECT THOSE CONTRIBUTORS WHO GAVE MORE THAN 2% OF THE AMOUNT ON LINE 1H OF PART VIII OF THIS FORM 990.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 4D</FormAndLineReferenceDesc>
        <ExplanationTxt>SUPPORTING THE NATION'S SCIENCE AND TECHNOLOGY STRATEGY, MITRE LABS INSPIRES BREAKTHROUGHS IN APPLIED SCIENCE AND ADVANCED TECHNOLOGY, WORKING TO ENSURE THE U.S. LEADS IN SCIENTIFIC, ECONOMIC, AND TECHNOLOGICAL INNOVATION. MITRE LABS PROVIDES TOP TECHNICAL TALENT, PLATFORMS, PARTNERSHIPS, AND VISION TO THE SIX FFRDCs OPERATED BY MITRE. ADDITIONALLY, MITRE LABS ADDRESSES KEY CHALLENGES THROUGH INDEPENDENT RESEARCH AND DEVELOPMENT BASED ON AN UNDERSTANDING OF FUTURE MISSION NEEDS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9</FormAndLineReferenceDesc>
        <ExplanationTxt>POST RETIREMENT BENEFIT ADJUSTMENT: $1,102,509</ExplanationTxt>
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    </IRS990ScheduleO>
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</Return>
