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        <TotalCompensationFilingOrg>154735</TotalCompensationFilingOrg>
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      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 1A: FIRST-CLASS OR CHARTER TRAVEL</Identifier>
        <Explanation>TRUSTEES (INCLUDING HONORARY TRUSTEES) ARE REIMBURSED FOR THEIR ACTUAL TRAVEL EXPENSES. TRAVEL BY AIR IS REIMBURSED UP TO ONE CLASS ABOVE COACH WHERE THE PUBLISHED TOTAL FLIGHT TIME EXCEEDS TWO HOURS.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 1A: TRAVEL FOR COMPANIONS</Identifier>
        <Explanation>TRAVEL BY SPOUSES OF TRUSTEES AND OFFICERS IS REIMBURSABLE IN CONNECTION WITH TRAVEL TO ONE BOARD MEETING PER YEAR, THE PARTICULAR MEETING TO BE AT THE RECIPIENT'S DISCRETION. THERE IS NO TRAVEL EXPENSE REIMBURSEMENT FOR THE SPOUSES OF HONORARY TRUSTEES.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 1A: TAX INDEMNIFICATION AND GROSS-UP PAYMENTS</Identifier>
        <Explanation>MITRE DOES NOT PROVIDE FOR ANY TAX INDEMNIFICATION TO ITS OFFICERS, TRUSTEES OR HCES. HOWEVER, FOR THOSE EMPLOYEES ON FOREIGN ASSIGNMENTS, INCLUDING HCES, MITRE DOES PROVIDE TAX GROSS-UPS FOR MEDICARE PAYROLL TAXES ON TAXABLE RELOCATION ALLOWANCES PAID TO THE EMPLOYEE ON THE FOREIGN ASSIGNMENT. MITRE ALSO PROVIDES FOR "TAX PROTECTION" FOR THOSE FOREIGN ASSIGNEE EMPLOYEES THAT HAVE EXPERIENCED A HIGHER MARGINAL TAX RATE APPLIED TO THEIR MITRE EARNINGS FOR A YEAR IN WHICH THEY WERE ON A MITRE FOREIGN ASSIGNMENT. MITRE DOES NOT PAY ANY FOREIGN INCOME TAXES AN EMPLOYEE MIGHT BE SUBJECT TO WHILE ON A FOREIGN ASSIGNMENT, BUT ANY FOREIGN TAXES PAID BY AN EMPLOYEE THAT ARE RELATED TO HIS FOREIGN ASSIGNMENT MITRE EARNINGS ARE INCLUDED IN ANY DETERMINATION OF ANY ELIGIBILITY FOR TAX PROTECTION RELIEF (AS ARE FOREIGN TAX CREDITS CLAIMED BY THE EMPLOYEE AGAINST HIS U.S. TAX LIABILITY FOR THE YEAR, THEREBY MITIGATING THE NEED FOR A TAX PROTECTION PAYMENT.)</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 1A: HOUSING ALLOWANCE</Identifier>
        <Explanation>SPECIAL PAY FOR ALL EXPATRIATE ASSIGNMENTS: MITRE PAYS A LIVING-COST ALLOWANCE TO HELP DEFRAY THE DIFFERENCE IN HOUSING AND GOODS &amp; SERVICES COSTS IN THE OVERSEAS LOCATION. THIS ALLOWANCE NORMALLY INCLUDES A COST OF LIVING ALLOWANCE (COLA) AND A HOUSING ALLOWANCE (HOLA). MITRE SETS THE ALLOWANCES BASED ON PRICE DATA AND STANDARDIZED PURCHASING MODELS PROVIDED BY AN EXTERNAL CONSULTANT SPECIALIZING IN LIVING COST DATA. THE ALLOWANCES ARE ADJUSTED, WHERE NECESSARY, TO REMAIN REASONABLE IN TERMS OF MITRE'S FINANCIAL CONSTRAINTS. ALLOWANCES ARE REVIEWED ANNUALLY AND ADJUSTED BASED ON CHANGES TO INCOME AND FAMILY SIZE. EMPLOYEES WHO LIVE IN GOVERNMENT-SUBSIDIZED HOUSING WILL NOT RECEIVE THE PORTION OF THE LIVING-COST ALLOWANCE RELATED TO HOUSING COST DIFFERENCES (HOLA).</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 1A: HEALTH OR SOCIAL CLUB DUES OR INITIATION FEES</Identifier>
        <Explanation>MITRE PROVIDES MEMBERSHIP FOR ITS PRESIDENT IN THE TOWER CLUB, A BUSINESS/SOCIAL CLUB IN THE AREA OF THE COMPANY'S MCLEAN, VIRGINIA HEADQUARTERS. THE CLUB'S FACILITIES ARE USED TO HOST BUSINESS MEETINGS AND CONFERENCES AND FOR OTHER BUSINESS-RELATED PURPOSES.</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SCH J, PT I,LINE 4B:NONQUALIFIED DEFERRED COMPENSATION PLAN DISTRIBUTIONS</Identifier>
        <Explanation>MITRE MADE THE FOLLOWING DISTRIBUTIONS FROM ITS NONQUALIFIED DEFERRED COMPENSATION PLAN: R.NESBIT $35,740 A. SINHA $65,570</Explanation>
      </Form990ScheduleJPartIII>
      <Form990ScheduleJPartIII>
        <Identifier>SCHEDULE J, PART I, LINE 7</Identifier>
        <Explanation>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.</Explanation>
      </Form990ScheduleJPartIII>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>APRIL WILLIAMS-PROVIDAKES-HIRED</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>SPOUSE OF OFFICER</Relationship>
        <AmountOfTransaction>108472</AmountOfTransaction>
        <DescriptionOfTransaction>EMPLOYMENT</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>111488</NamePerson>
        </NameOfInterestedPerson>
        <SharingOfRevenues>false</SharingOfRevenues>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>GEORGE F PROVIDAKES - HIRED 89</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>BROTHER OF OFFICER</Relationship>
        <AmountOfTransaction>276615</AmountOfTransaction>
        <DescriptionOfTransaction>EMPLOYMENT</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>JAMES F PROVIDAKES - HIRED 69</NamePerson>
        </NameOfInterestedPerson>
        <Relationship>BROTHER OF OFFICER</Relationship>
        <AmountOfTransaction>274898</AmountOfTransaction>
        <DescriptionOfTransaction>EMPLOYMENT</DescriptionOfTransaction>
        <SharingOfRevenues>false</SharingOfRevenues>
      </Form990ScheduleLPartIV>
      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>NOTE HIRE DATE OF OFFICER IN COLB</NamePerson>
        </NameOfInterestedPerson>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>82989 IS AFTER HIRE DATE OF THOS</NamePerson>
        </NameOfInterestedPerson>
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      <Form990ScheduleLPartIV>
        <NameOfInterestedPerson>
          <NamePerson>IN COL A</NamePerson>
        </NameOfInterestedPerson>
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      <Form990ScheduleLPartV>
        <Identifier>Schedule L, Part IV</Identifier>
        <Explanation>*Office located in Polk Building, Mclean, VA. Works in National Security Engineering Center. **Office located in 'C' Building, Bedford, MA. Works as chief engineer in C2C Center. ***Office located at company's Eatontown, NJ site. Works in Army Programs, C2C Center.</Explanation>
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    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 1A</Identifier>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 2</Identifier>
        <Explanation>Martin Faga and Ronald Fogleman share service on another company's board. Edmund Giambastiani, Jr. and Donald Kerr share service on another company's board. George Campbell and Nicholas Donofrio share service on another company's board.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 11B</Identifier>
        <Explanation>A DRAFT OF THE COMPLETED FORM 990 IS REVIEWED BY THE BOARD'S AUDIT COMMITTEE AND BY THE COMPANY'S CHIEF FINANCIAL OFFICER, ITS GENERAL COUNSEL AND ITS 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINE 12C</Identifier>
        <Explanation>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 Trusteeship 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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION A, LINES 15 A &amp; B</Identifier>
        <Explanation>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 the 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's Executive 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 of 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 2012.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART VI, SECTION C , LINE 19</Identifier>
        <Explanation>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.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART III, LINE 4D</Identifier>
        <Explanation>OTHER CONTRACT SERVICES: EXPENSES, $5,152,000</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, SCHEDULE B, PART I</Identifier>
        <Explanation>THE MITRE CORPORATION RECEIVES CONTRIBUTIONS FROM A "U.S. GOVERNMENT CLASSIFIED SOURCE," THE IDENTITY OF WHICH CANNOT BE REVEALED AND FOR WHICH CONTRIBUTION INFORMATION CANNOT BE REPORTED ON PART I OF SCHEDULE B BECAUSE OF ELECTRONIC FILING PARAMETERS. ACCORDINGLY, BY WAY OF THIS ADDENDUM TO SCHEDULE B, THE ORGANIZATION IS ACKNOWLEDGING RECEIPT OF $128,698,000 FROM THIS CONTRIBUTION SOURCE FOR THE REPORTING PERIOD.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>FORM 990, PART XI, LINE 5</Identifier>
        <Explanation>THE AMOUNT OF $(65,000) REPRESENTS AN UNREALIZED LOSS.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <Identifier>HOURS DEVOTED FOR RELATED ORGANIZATION</Identifier>
        <ReturnReference>FORM 990 PART VII</ReturnReference>
        <Explanation>NAME:MARK W. KONTOS TITLE:SENIOR VP/ TREASURER/CFO HOURS:</Explanation>
      </GeneralExplanation>
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      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>THE MITRE CORPORATION EMP BEN TRUST</BusinessNameLine1>
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        <AddressUS>
          <AddressLine1>7515 COLSHIRE DR TAX ADMIN</AddressLine1>
          <City>MCLEAN</City>
          <State>VA</State>
          <ZIPCode>22102</ZIPCode>
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        <EIN>043205946</EIN>
        <PrimaryActivities>VEBA</PrimaryActivities>
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        <ExemptCodeSection>501(c)(9)</ExemptCodeSection>
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          <BusinessNameLine1>MITRE</BusinessNameLine1>
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          <BusinessNameLine1>THE MITRE CORPORATION EMP BEN TRUST</BusinessNameLine1>
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        <MethodOfAmtDetermination>FMV</MethodOfAmtDetermination>
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