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L-3 MAPPS to Add Value to Embalse Refurbishment with Digital Control Computer Systems

MONTREAL, May 2, 2011 - L-3 MAPPS has been awarded a contract from Nucleoeléctrica Argentina S.A. (NA-SA) to replace the Embalse nuclear power plant's Digital Control Computer (DCC) systems hardware. Four DCC systems will be delivered to NA-SA under the contract. The first system will be used as a testing and training platform and is due to be installed in early 2013. Three other redundant DCC systems for plant operations are expected to enter service in mid-2014.

DCC systems are used to monitor and control the major reactor and power plant functions at CANDU* nuclear power plants. The new DCC systems will feature the latest SSCI-890 CPUs and modern VME-based replacements for the existing Ramtek display system, and will replace the Varian 73 computer systems and related equipment.

"L-3 MAPPS is committed to working with NA-SA on the Embalse plant," said Michael Chatlani, vice president of marketing & sales for L-3 MAPPS Power Systems and Simulation. "Along with the full-scope simulator we are currently developing, the replacement DCC systems will help improve plant operations."

"In support of the Embalse plant refurbishment project, NA-SA is pleased to work with knowledgeable industry partners like L-3 MAPPS," said Rubén Semmoloni, Embalse nuclear power plant life-extension project director, NA-SA.

The Embalse nuclear power station is one of two operational nuclear power plants in Argentina. It is located on the southern shore of a reservoir on the Rio Tercero, near the city of Embalse in Córdoba Province, 110 kilometers southwest of Córdoba City. The single unit at Embalse is a CANDU pressurized heavy water reactor with a net output of 600 MWe, which went into commercial operation on January 20, 1984. Embalse also produces the cobalt-60 radioisotope, which is used for medical and industrial applications. With the current plant refurbishment plans, the station's life is expected to be extended for another 25 years.

L-3 MAPPS, a division of L-3 Marine & Power Systems, has over 25 years of experience in pioneering technological advances in the marine automation field and over 35 years of experience in delivering high-fidelity power plant simulation to leading utilities worldwide. In addition, the company has more than three decades of expertise in supplying plant computer systems for Canadian heavy water reactors. L-3 MAPPS also provides targeted controls and simulation solutions to the space sector. To learn more about L-3 MAPPS, please visit the company's website at www.L-3com.com/MAPPS.

L-3 Maritime Systems, a division of L-3 Marine & Power Systems, is a leading supplier of marine systems and electronics, including integrated bridge, navigation, communications, control and sensing systems for the U.S. Navy, the Military Sealift Command, the U.S. Coast Guard and allied navies. L-3 Maritime Systems also produces solutions for naval applications such as automated battery and environmental monitoring systems, alarm and announcing systems, video data distribution systems, computer information systems, integrated communications systems, and integrated platform management systems.

Comprised of more than 25 operating companies, L-3 Marine & Power Systems (L-3 M&PS) is a worldwide leader in maritime automation and control, navigation, communications, dynamic positioning, and power distribution and conditioning for the U.S. Navy, allied foreign navies and commercial customers worldwide. With over 94 locations in 20 countries, L-3 M&PS is a cohesive, global partner with extensive capabilities and a proven track record in delivering the highest level of technology, service and integration. To learn more about L-3 Marine & Power Systems, please visit the company's website at www.L-3com.com/MPS.

Headquartered in New York City, L-3 Communications employs approximately 63,000 people worldwide and is a prime contractor in C3ISR (Command, Control, Communications, Intelligence, Surveillance and Reconnaissance) systems, aircraft modernization and maintenance, and government services. L-3 is also a leading provider of a broad range of electronic systems used on military and commercial platforms. The company reported 2010 sales of $15.7 billion. To learn more about L-3, please visit the company's website at www.L-3com.com.

Safe Harbor Statement Under the Private Securities Litigation Reform Act of 1995
Except for historical information contained herein, the matters set forth in this news release are forward-looking statements. Statements that are predictive in nature, that depend upon or refer to events or conditions or that include words such as "expects," "anticipates," "intends," "plans," "believes," "estimates," "will," "could" and similar expressions are forward-looking statements. The forward-looking statements set forth above involve a number of risks and uncertainties that could cause actual results to differ materially from any such statement, including the risks and uncertainties discussed in the company's Safe Harbor Compliance Statement for Forward-Looking Statements included in the company's recent filings, including Forms 10-K and 10-Q, with the Securities and Exchange Commission. The forward-looking statements speak only as of the date made, and the company undertakes no obligation to update these forward-looking statements.