AVIEL Systems Names Vincent Kiernan as CFO; Former SVP of Finance of Anteon International to Join AVIEL Executive Team.

MCLEAN, Va. -- AVIEL Systems, Inc. announced today that it has hired Vincent Kiernan as Chief Financial Officer. Kiernan, formerly SVP of Finance for Anteon International, will join the company immediately, and assist CEO and President, John Chapel, in overseeing the finance, reporting and corporate development functions at the company.

"We are happy to welcome Vince to the company. His experience is perfectly suited for the next phase of AVIEL's growth. He helped lead the finance team in his eight years at Anteon, as that company grew from $310 million to more than $2 billion in market value at the time of its sale to General Dynamics earlier this month. We look forward to adding his capabilities to an already strong executive team," commented Chapel.

Kiernan added, "I am excited to join AVIEL and believe the company's people and prospects are among the best in the federal government IT services field. The management team has the experience, relationships and expertise to build a company of substantially greater size, especially given its high-quality and highly-skilled personnel, and its business with high-growth federal agencies such as the Department of Homeland Security."

Kiernan was with Anteon from 1998 to 2006 as Senior Vice President of Finance where he maintained oversight of the finance and accounting functions, including SEC and internal reporting, budgeting and accounting systems. He was also actively involved in due diligence, acquisition and integration of the nine companies Anteon acquired. Prior to joining Anteon, Mr. Kiernan was a managing director at KPMG Peat Marwick from 1995 to 1998. Kiernan is a Certified Management Accountant and a member of the Institute of Management Accountants. He received his M.B.A. from the College of William and Mary and B.S. degree in Business from Wake Forest University.

AVIEL Systems recently announced its intention to merge with TAC Acquisition Corp. (OTCBB:TACA), a Greenwich, CT-based special purpose acquisition company, for total consideration of approximately $100 million.

About AVIEL Systems, Inc.

Headquartered in McLean, Virginia, AVIEL Systems, Inc. is a provider of IT and program management consulting solutions to the federal government in areas critical to national security, transportation and defense. AVIEL was formed earlier this year to serve as a holding company for OPTIMUS Corporation and Performance Management Consulting, Inc. For more information visit www.avielinc.com.

About TAC Acquisition Corp.

TAC Acquisition Corp. is a publicly-traded company formed for the purpose of acquiring an operating business in the following technology-related sectors: software, IT services, media, telecommunications, semiconductor, hardware, internet and technology-enabled services. Approximately $120 million of net proceeds was raised through TAC's initial public offering in June 2005 (symbol:TACA).