OPNET Announces New System-in-the-Loop Software for Inter-operability Testing, Training, and Wargaming Exercises

The foundation of OPNET SITL is based on licensed technology fromBAE Systems, originally developed to support defense programs such asFCS, JTRS, WIN-T, and Network-Centric Enterprise Services. Benefitsinclude reduced program testing costs, shorter test schedules, reducedprogram risks, and increased test scenario scalability. In addition,SITL facilitates rapid development of training systems for newtechnologies.

John Deal, Director for C4ISR Systems Engineering/CTO,Communications & Information Systems, stated, "BAE Systems haspioneered the use of OPNET simulations in online hardware-in-the-loopenvironments. Since 1998, members of BAE Systems have been enhancingthe capability to interface simulation models to real hardware andsoftware systems. We have also developed a distributed simulationcapability to enable modeling of large-scale networks in real time.This new agreement will enable OPNET's large installed base of usersto take advantage of our work in these areas."

Alain J. Cohen, OPNET's President and CTO, stated, "The new SITLsoftware will significantly simplify the process of connecting OPNETto live systems. The SITL workflow will result in rapid and lower-costtesting, training, and wargaming exercises for our defense andequipment manufacturer customers."

Availability

General availability of the OPNET System-in-the-Loop (SITL) moduleand related services are planned for December 2005. OPNET SITL wasdemonstrated at the C4ISR Interoperability Conference, December5th-7th in Arlington, Virginia.

About OPNET Technologies, Inc.

Founded in 1986, OPNET Technologies, Inc. (NASDAQ:OPNT) is aleading provider of management software for networks and applications.For more information about OPNET and its products, please visithttp://www.opnet.com.

About BAE Systems

BAE Systems is an international company engaged in thedevelopment, delivery and support of advanced defense and aerospacesystems in the air, on land, at seam and in space. The companydesigns, manufactures, and supports military aircraft, combatvehicles, surface ships, submarines, radar, avionics, communications,electronics, and guided weapon systems.

OPNET, OPNETWORK, OPNET Technologies, and all OPNET product namesare trademarks of OPNET Technologies, Inc. All other trademarks arethe property of their respective owners.

Statements in this press release that are not purely historicalfacts may constitute forward-looking statements as defined in thePrivate Securities Litigation Reform Act of 1995. OPNET Technologies,Inc. ("OPNET") assumes no obligation to update statements.Forward-looking statements are predictions based upon informationavailable to OPNET as of the date of this press release and involverisks and uncertainties; therefore, actual events or results maydiffer materially. For a discussion of risk factors, see OPNET'sreports, including its most recent 10-Q and 10-K, filed with theSecurities & Exchange Commission.

Note to editors: The word OPNET is spelled with all upper-caseletters.