Exhibit 31.1

Written Certification of Chief Executive Officer

I, Sterling E. Phillips, Jr., certify
that:

1. I have reviewed this annual report on Form 10-K of GTSI Corp.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary
to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash
flows of the registrant as of, and for, the periods presented in this report;

4. The registrants other certifying
officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f)
and 15d-15(f)) for the registrant and have:



| | a. | Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material
information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;
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| | b. | Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide
reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;
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| | c. | Evaluated the effectiveness of the registrants disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and
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| | d. | Disclosed in this report any change in the registrants internal control over financial reporting that occurred during the registrants most recent fiscal
quarter that has materially affected, or is reasonable likely to materially affect, the registrants internal control over financial reporting; and
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5. The registrants other certifying officer and I have disclosed, based upon our most recent evaluation of internal control over financial reporting, to the registrants auditors and the audit
committee of the registrants board of directors:



| | a. | All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely
affect the registrants ability to record, process, summarize and report financial information; and
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| | b. | Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrants internal control over financial
reporting.
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|                                                 
|-------------------------------------------------
|Date: April 12, 2012                             
|                                                 
|/s/ STERLING E. PHILLIPS, JR.                    
|Sterling E. Phillips, Jr.
Chief Executive Officer