Affiliate of UNICOM Systems, Inc. successfully completes tender offer for shares of GTSI Corp.

MISSION HILLS, CA and HERNDON, VA., June 18, 2012 – GTSI Corp. (NASDAQ: GTSI), a systems integration, solutions and services provider to government and UNICOM Systems, Inc. (“UNICOM”), a global information technology company and part of the UNICOM group of companies, today announced that UNICOM SUB ONE, Inc. (“UNICOM SUB ONE”), an affiliate of UNICOM, successfully completed its tender offer for the outstanding shares of common stock of GTSI for $7.75 per share in cash, without interest and less any applicable withholding taxes. The offering period expired at 12:00 Midnight, New York City time, on Friday, June 15, 2012. The depositary for the tender offer has advised that, as of the expiration time, 8,884,283 shares of GTSI common stock had been validly tendered and not withdrawn, including 75,135 shares that had been tendered pursuant to notices of guaranteed delivery, representing approximately 91.516% of the outstanding shares of GTSI. All such shares have been accepted for payment in accordance with the terms of the tender offer, including the shares that were tendered pursuant to notices of guaranteed delivery. UNICOM expects to effect a merger of UNICOM SUB ONE with and into GTSI without a vote or meeting of GTSI’s stockholders as soon as practicable. In the merger, each outstanding GTSI share not tendered and purchased in the offer (other than those as to which holders properly exercise dissenters rights, if any) will be converted into the right to receive the same $7.75 per share price, without interest and less any required withholding taxes, that was paid in the tender offer. As a result of the merger, GTSI will become a wholly owned subsidiary of UNICOM. Following the merger, GTSI’s common stock will cease to be traded on the NASDAQ Global Select Market.