<PAGE>

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K
                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934


         Date of Report (Date of earliest event reported): July 16, 2002


                                   GTSI CORP.

                            Incorporated in Delaware

                           Commission File No. 0-19394

                  I.R.S. Employer Identification No. 54-1248422

                            3901 Stonecroft Boulevard
                         Chantilly, Virginia 20151-1010
                                 (703) 502-2000

<PAGE>

ITEM  4. CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT.

      On July 11, 2002, GTSI Corp. ("GTSI") decided to dismiss its independent
auditors, Arthur Andersen LLP ("Arthur Andersen") and approved the selection of
Ernst & Young LLP to serve as GTSI's independent auditor for the current fiscal
year which ends on December 31, 2002. This decision was recommended by GTSI's
Audit Committee and approved by GTSI's Board of Directors.

      Arthur Andersen's reports on GTSI's consolidated financial statements for
each of the years ended December 31, 2001 and December 31, 2000 did not contain
an adverse opinion or disclaimer of opinion, nor were they qualified or modified
as to uncertainty, audit scope or accounting principles.

      During the years ended December 31, 2001 and 2000, and the interim period
between December 31, 2001 and the date of this Form 8-K, there were no
disagreements between GTSI and Arthur Andersen on any matter of accounting
principles or practices, financial statement disclosure or auditing scope or
procedure which, if not resolved to Arthur Andersen's satisfaction, would have
caused them to make reference to the subject matter of the disagreement in
connection with their report for such years; and there were no reportable events
as defined in Item 304(a)(1)(v) of Regulation S-K.

      During the years ended December 31, 2001 and 2000, and the interim period
between December 31, 2001 and the date of this Form 8-K, neither GTSI nor anyone
acting on its behalf consulted Ernst & Young LLP with respect to the application
of accounting principles to a specified transaction, either completed or
proposed, or the type of audit opinion that might be rendered on our
consolidated financial statements, or any other matters or reportable events as
set forth in Items 304(a)(2)(i) and (ii) of Regulation S-K.

      Pursuant to Item 304(a)(3) of Regulation S-K, we have requested that
Arthur Andersen LLP furnish us with a letter addressed to the SEC stating
whether or not Arthur Andersen LLP agrees with the above statements. However, we
have been informed that, due to circumstances unrelated to us, Arthur Andersen
LLP does not intend to file any communication with the Securities and Exchange
Commission in response to the aforementioned matters.

<PAGE>

SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                             GTSI CORP.


                                             By: /S/ QUANG LE
                                                 -------------------------------
                                                 Quang Le
                                                 Acting Chief Financial Officer

Date:  July 16, 2002
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UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 8-K
                                 CURRENT REPORT

                       Pursuant to Section 13 or 15(d) of
                       the Securities Exchange Act of 1934

         Date of Report (Date of earliest event reported): July 16, 2002

                                   GTSI CORP.

                            Incorporated in Delaware

                           Commission File No. 0-19394

                  I.R.S. Employer Identification No. 54-1248422

                            3901 Stonecroft Boulevard
                         Chantilly, Virginia 20151-1010
                                 (703) 502-2000
ITEM  4. CHANGES IN REGISTRANT'S CERTIFYING ACCOUNTANT.

      On July 11, 2002, GTSI Corp. ("GTSI") decided to dismiss its independent
auditors, Arthur Andersen LLP ("Arthur Andersen") and approved the selection of
Ernst & Young LLP to serve as GTSI's independent auditor for the current fiscal
year which ends on December 31, 2002. This decision was recommended by GTSI's
Audit Committee and approved by GTSI's Board of Directors.

      Arthur Andersen's reports on GTSI's consolidated financial statements for
each of the years ended December 31, 2001 and December 31, 2000 did not contain
an adverse opinion or disclaimer of opinion, nor were they qualified or modified
as to uncertainty, audit scope or accounting principles.

      During the years ended December 31, 2001 and 2000, and the interim period
between December 31, 2001 and the date of this Form 8-K, there were no
disagreements between GTSI and Arthur Andersen on any matter of accounting
principles or practices, financial statement disclosure or auditing scope or
procedure which, if not resolved to Arthur Andersen's satisfaction, would have
caused them to make reference to the subject matter of the disagreement in
connection with their report for such years; and there were no reportable events
as defined in Item 304(a)(1)(v) of Regulation S-K.

      During the years ended December 31, 2001 and 2000, and the interim period
between December 31, 2001 and the date of this Form 8-K, neither GTSI nor anyone
acting on its behalf consulted Ernst & Young LLP with respect to the application
of accounting principles to a specified transaction, either completed or
proposed, or the type of audit opinion that might be rendered on our
consolidated financial statements, or any other matters or reportable events as
set forth in Items 304(a)(2)(i) and (ii) of Regulation S-K.

      Pursuant to Item 304(a)(3) of Regulation S-K, we have requested that
Arthur Andersen LLP furnish us with a letter addressed to the SEC stating
whether or not Arthur Andersen LLP agrees with the above statements. However, we
have been informed that, due to circumstances unrelated to us, Arthur Andersen
LLP does not intend to file any communication with the Securities and Exchange
Commission in response to the aforementioned matters.
SIGNATURES

      Pursuant to the requirements of the Securities Exchange Act of 1934, the
Registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                             GTSI CORP.

                                             By: /S/ QUANG LE
                                                 -------------------------------
                                                 Quang Le
                                                 Acting Chief Financial Officer

Date:  July 16, 2002