UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
 Washington, D.C. 20549
 FORM 10-K/A
 (Amendment No. 1)
 ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
SECURITIES EXCHANGE ACT OF 1934
 For the fiscal year ended December 31, 2007
 Commission File Number: 0-19394
 GTSI CORP.
  Delaware
    
    54-1248422(State or other jurisdiction of
    
    (I.R.S. Employerincorporation or organization)
    
    Identification No.)3901 Stonecroft Boulevard, Chantilly, VA
    
    20151-1010(Address of principal executive offices)
    
    (Zip Code)
 703-502-2000
 Title of each class
    
    Name of each exchange on which registeredCommon Stock, $0.005 par value
    
    NASDAQ Global Market
 None
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  Large accelerated filer o
    
    Accelerated filer þ
    
    Non-accelerated filer o
    
    Smaller reporting company o(Do not check if a smaller reporting company)
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EXPLANATORY NOTE
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SIGNATURES
  GTSI CORP.By:
    /s/ JAMES J. LETOJames J. LetoChief Executive Officer  Signature
    
    Title
    
    Date/s/ JAMES J. LETO
James J. Leto
    
    Chief Executive Officer (Principal
Executive Officer)
    
    November 13, 2008/s/ PETER WHITFIELD
Peter Whitfield
    
    Senior Vice President and Chief
Financial Officer (Principal Financial and
Accounting Officer)
    
    November 13, 2008
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EXHIBIT INDEX
 ExhibitNumber
    
    Description3.1
    
    
    Restated Certificate of Incorporation (1)3.2
    
    
    Bylaws, as amended (2)10.1
    
    
    GTSI Employees 401(k) Investment Plan, and amendments No. 1, 2 and 3 thereto (3)10.2
    
    
    Employee Stock Purchase Plan, as amended to date (4)10.3
    
    
    1994 Stock Option Plan, as amended to date (5)10.4
    
    
    Amended and Restated 1996 Stock Incentive Plan (6)10.5
    
    
    1997 Non-Officer Stock Option Plan, as amended to date (7)10.6
    
    
    Lease dated August 11, 1995 between the Company and Security Capital Industrial Trust, and
Amendments for distribution center facility (8)10.7
    
    
    Lease dated December 10, 1997 between the Company and Petula Associates, Ltd. and Amendment for
headquarters facility (8)10.8
    
    
    Second Amendment to Deed of Lease dated February 11, 2005 between the Company and AG/ARG Avion,
L.L.C. (successor-in-interest to Petula Associates, Ltd.) for headquarters facility. (3)10.9
    
    
    Credit Agreement dated as of June 2, 2006 between GTSI Corp., SunTrust Bank and Bank of America (9)10.10
    
    
    Credit Agreement dated as of June 2, 2006 between GTSI Corp., and Crystal Capital Fund, L.P. (9)10.11
    
    
    First Amendment to Credit Agreement dated as of July 13, 2006 between GTSI Corp., SunTrust Bank
and Bank of America (10)10.12
    
    
    First Amendment to Credit Agreement dated as of July 13, 2006 between GTSI Corp. and Crystal
Capital Fund, L.P. (10)10.13
    
    
    Second Amendment to Credit Agreement dated as of November 30, 2006 between GTSI Corp. the Lenders,
the other Borrower Parties, and SunTrust Bank. (11)10.14
    
    
    Second Amendment to Credit Agreement dated as of November 30, 2006 between GTSI Corp. the
Lenders, the other Borrower Parties, and Crystal Capital Fund, L.P. (11)10.15
    
    
    Third Amendment to Credit Agreement dated as of March 30, 2007 between GTSI Corp. the Lenders, the
other Borrower Parties, and SunTrust Bank. (13)10.16
    
    
    Third Amendment to Credit Agreement dated as of March 30, 2007 between GTSI Corp. the Lenders,
the other Borrower Parties, and Crystal Capital Fund, L.P. (13)10.17
    
    
    Amended and Restated 2007 Stock Incentive Plan (18)10.18
    
    
    Lease dated December 5, 2007 between the Company and SP Herndon Development LP for new
headquarters facility (19)10.19
    
    
    Payment in full by the Company of its subordinated secured term loan agreement with Crystal
Capital Fund, L.P. (20)10.20
    
    
    GTSI Corp. Long Term Incentive Plan * (14)10.21
    
    
    GTSI 2005 Executive Incentive Compensation Plan * (3)10.22
    
    
    Form of GTSI Change in Control Agreement *(3)10.23
    
    
    Transition Agreement with M. Dendy Young dated February 15, 2006* (15)10.24
    
    
    Employment Agreement dated February 16, 2006 between the Registrant and James J. Leto* (16)10.25
    
    
    Form of GTSI Severance Agreement *(17)10.26
    
    
    Amendment to Employment Agreements date June 8, 2007* (22)10.27
    
    
    Employment Agreement dated December 1, 2007 between the Registrant and Scott Friedlander* (23)14.1
    
    
    Code of Ethics (12)16.1
    
    
    Changes in Companys Certifying Accountant (21)23.1
    
    
    Consent of PricewaterhouseCoopers LLP (24)23.2
    
    

Consent
of Aronson & Company (filed herewith)23.3
    
    
    Consent of Ernst & Young LLP (24)31.1
    
    
    Section 302 Certification of Chief Executive Officer (filed herewith)
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ExhibitNumber
    
    Description31.2
    
    
    Section 302 Certification of Chief Financial Officer (filed herewith)32
    
    
    Section 906 Certification of Chief Executive Officer and Chief Financial Officer (filed herewith)99.1
    
    
    Consolidated Financial Statements for Eyak Technology, LLC for the years ended December 31, 2007
and 2006 (audited) (filed herewith)99.2
    
    
    Consolidated Financial Statements for Eyak Technology, LLC for the year ended December 31, 2005
(unaudited) (filed herewith)
 *
    
    Management contracts and compensatory plans and arrangements required to be filed pursuant to
Item 15 (c).(1)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2000.(2)
    
    Incorporated by reference to the Registrants Current Report on Form 8-K dated December 1,
2007.(3)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2004.(4)
    
    Incorporated by reference to the Registrants Current Report on Form 8-K dated December 27,
2005.(5)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2002.(6)
    
    Incorporated by reference to Appendix A of the Registrants 2005 Proxy Statement.(7)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2002.(8)
    
    Incorporated by reference to the Registrants Quarterly Report on Form 10-Q for the period
ended September 30, 2004.(9)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated June 2, 2006.(10)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated July 13, 2006.(11)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated December 5,
2006.(12)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2003.(13)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2006.(14)
    
    Incorporated by reference to Appendix B of the Registrants 2004 Proxy Statement(15)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated February 15,
2006.(16)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated February 16,
2006.(17)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated April 28,
2006.(18)
    
    Incorporated by reference to the Registrants Quarterly Report on Form 10-Q for the period
ended March 31, 2007.(19)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated December 5,
2007.(20)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated February 25,
2008.(21)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated June 5, 2007.(22)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated June 8, 2007.(23)
    
    Incorporated by reference to the Registrants current report on Form 8-K dated December 1,
2007.(24)
    
    Incorporated by reference to the Registrants Annual Report on Form 10-K for the year ended
December 31, 2007.  5