Affiliate of UNICOM Systems, Inc. and GTSI Corp. announce completion of merger

MISSION HILLS, CA and HERNDON, VA., June 21, 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 that they have successfully completed the acquisition of GTSI by UNICOM SUB ONE, Inc. (“UNICOM SUB ONE”), an affiliate of UNICOM.

The offering period of the tender offer for all of the outstanding shares of common stock of GTSI by UNICOM SUB ONE, for $7.75 per share in cash, without interest and less any applicable withholding taxes, 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has advised that, as of the expiration time, 8,884,283 shares of GTSI common stock had been validly tendered and not withdrawn representing approximately 91.516% of the outstanding shares of GTSI.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.

The merger of UNICOM SUB ONE with and into GTSI without a vote or meeting of GTSI’s stockholders was effected today, June 20, 2012. As a result of the merger, all outstanding shares of common stock of GTSI, other than shares held by UNICOM or its subsidiaries or shares held by GTSI’s stockholders who validly exercise appraisal rights under Delaware law, have been cancelled and converted into the right to receive a cash payment in an amount equal to the same $7.75 offer price per share that was paid in the offer, without interest and less any applicable withholding taxes. The American Stock Transfer & Trust Company, LLC, acting as the exchange agent for the merger, will mail to the remaining former stockholders of GTSI materials necessary to exchange their former GTSI shares for such payment.

As a result of the completion of the merger, GTSI became a privately-held company and trading of its common stock on the NASDAQ Global Market will be suspended after the close of trading on June 21, 2012. GTSI intends to deregister its common stock and to suspend its reporting obligations under the Securities Exchange Act of 1934, as amended, by filing a Form 15 with the Securities and Exchange Commission.

Media Contact

Mr. Russ Guzzo

About UNICOM® Global

UNICOM Global consists of more than fifty (50) corporate entities encompassing a wide range of businesses across all geographic regions. With its corporate headquarters in Los Angeles, California, to offices in Illinois, Kentucky, Florida, Massachusetts, Maryland, Minnesota, New Hampshire, North Carolina, New Jersey, Texas and Virginia, throughout EMEA in the UK, Ireland, Germany, France, Italy, Spain, Denmark, Belgium, Switzerland and the UAE, and across Asia/Pacific with locations in Japan, China, India, Australia, Korea, Thailand, Taiwan and the Philippines.

UNICOM Global offers deep in-house resources and flexible IT solutions to our partners worldwide. UNICOM Global focuses on acquiring and integrating mature and growing mid-cap NASDAQ, London Stock Exchange AIM and German publicly-traded companies in technology, financing, IT, real estate, and business services. Please visit our websites for additional information about the services, products and solutions that UNICOM Global offers:

About UNICOM Systems, Inc.

The UNICOM Systems technology division delivers world-class CICS automation and z/OS and z/VM software solutions to IBM Z customers globally, integration services and solutions to commercial and government organizations, and application development tools for Linux/Unix and Windows customers.

UNICOM's flagship product, AUTOMON/CICS, is an award winning solution which powers some of the largest CICS installations worldwide. Today UNICOM Systems offers dozens of mission-critical solutions for a variety of platforms in several categories including Performance Management, Application Lifecycle Management, Storage and Security Management, Application Development and Application Modernization.

UNICOM Global - Assets, capital and investment management

UNICOM Systems - IBM Mainframe software products

UNICOM Government (formerly NASDAQ: GTSI) - Government IT solutions

UNICOM Engineering (formerly NASDAQ: NEI) Appliance platform

UNICOM Science and Technology Parks

UNICOM Technology Park – Innovation Labs in Virginia

UNICOM Science and Technology Park – Innovation Labs in New Jersey

UNICOM Capital - Business and Financial Services

USRobotics - Data communications products

Memeo - Enterprise-grade Secure File Sharing for the Cloud

Firetide - Wireless technology solutions for security and transportation

DETEC - Document composition products

SoftLanding Systems - IBM i software products

Macro 4 (formerly LONDON: MAO) - Document Management products

illustro - z/OS and z/VSE software products

iET Solutions - ITSM software products

Eden - Mergers & Acquisitions, Business & Financial Services, and Real Estate - Hardware, Software, Outsourcing and Professional Services

All trademarks referenced herein are trademarks of their respective companies.