**Exhibit 31.2**

 

Written Certification of Chief Financial Officer

 

I, Thomas A. Mutryn, certifythat:

 

1.  I have reviewed this quarterly report on Form10-Q of GTSI Corp.;

 

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

 

3.  Based on my knowledge, the financialstatements and other financial information included in this report, fairlypresent in all material respects the financial condition, results of operationsand cash flows of the registrant as of, and for, the periods presented in thisreport;

 

4.  The registrant’s other certifying officer andI are responsible for establishing and maintaining disclosure controls andprocedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) andinternal control over financial reporting (as defined in Exchange Act Rules13s-15(f) and 15d-15(f)), for the registrant and have:

a.                     Designed such disclosure controlsand procedures, or caused such disclosure controls and procedures to bedesigned under our supervision, to ensure that material information relating tothe registrant, including its consolidated subsidiaries, is made known to us byothers within those entities, particularly during the period in which thisreport is being prepared;

b.                    Designed such internal control overfinancial reporting , or cashed such internal control over financial reportingto be designed under our supervision, to provide reasonable assurance regardingthe reliability of financial reporting and the preparation of financialstatements for external purposes in accordance with generally acceptedaccounting principles;

c.                     Evaluated the effectiveness of theregistrant’s disclosure controls and procedures and presented in this reportour conclusions about the effectiveness of the disclosure controls andprocedures, as of the end of the period covered by this report based on suchevaluation: and

d.                    Disclosed in this report any changein the registrant’s internal control over financial reporting that occurredduring the registrant’s most recent fiscal quarter that has materiallyaffected, or is reasonable likely to materially affect, the registrants’internal control over financial reporting; and

 

5.  The registrant’s other certifying officer andI have disclosed, based upon our most recent evaluation of internal controlover financial reporting, to the registrants’ auditors and the audit committeeof the registrant’s board of directors: 

a.                     All significant deficiencies andmaterial weaknesses in the design or operation of internal control overfinancial reporting which are reasonable likely to adversely affect theregistrant’s ability to record, process, summarize and report financialinformation; and 

b.                    Any fraud, whether or not material,that involves management or other employees who have a significant role in theregistrant’s internal control over financial reporting.

 

Date:                    November5, 2004

 
| /s/ Thomas A. Mutryn |                                               |
|----------------------|----------------------------------------------------|
|                 | Thomas A.  Mutryn                                  |
|                 | Senior Vice  President and Chief Financial Officer |
|                      |                                                    |  |

 

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