As previously announced, GTSI ® Corp. (NASDAQ: GTSI), a systems integration, solutions and services provider to government, entered into a definitive agreement on May 7, 2012 to be acquired through a cash tender offer at $7.75 per share by an affiliate of UNICOM ® Systems, Inc. (“UNICOM”), a global information technology company and part of the UNICOM ® group of companies, in a transaction with an expected total value of approximately $76.67 million. As a result of entering into the definitive merger agreement, GTSI reminds its stockholders that it has postponed indefinitely its 2012 annual meeting of stockholders previously scheduled for May 25, 2012. This postponement was initially announced May 7, 2012 and this reminder is being issued in response to inquiries to GTSI from stockholders. About GTSI Corp. GTSI (NASDAQ: GTSI) is a leading provider of technology solutions and professional services to federal, state and local governments. Founded in 1983, GTSI has helped meet the unique IT needs of more than 1,700 governmental agencies nationwide. GTSI professionals draw on their deep knowledge, strategic partnerships, customer service and more than 740 industry certifications to guide agencies in selecting the most cost-effective technology available. GTSI has extensive capabilities and past performance in software development, data center, networking, collaboration, security and cloud computing solutions. In addition, GTSI's advanced engineering, integration, support and financial services - and broad portfolio of contracts - ease the planning, purchasing and deployment of solutions, and facilitates the management of mission-critical IT throughout the lifecycle. Headquartered in Herndon, VA, GTSI has approximately 450 employees. For more information visit GTSI's website at www.gtsi.com. About Unicom Systems, Inc. UNICOM ® Systems, Inc., a division of the UNICOM group of companies, is a global leader in providing innovative software and solutions for the enterprise computing community. Through over three decades of continued development and commitment, UNICOM has redefined the economics and quality of automation for its customers, delivering a new era of collaboration, data management, data-warehousing, outsourcing, integration, communications and commerce. About The UNICOM ® Group www.unicomglobal.com The UNICOM Group consists of twenty (20) entities with offices in Los Angeles, Dallas, Boston, New Hampshire, New Jersey, Germany, France, UK, Italy, Spain, Belgium and Switzerland. UNICOM focused on acquiring and integrating mature and growing mid-cap NASDAQ and London Stock Exchange AIM companies in the technology, financing, real estate, and business services. UNICOM offers deep in-house resources and flexible solutions to sellers worldwide, including privatization, core-products consolidation, IT assets alignments, management independence, integration matrix, and global business strategy.