L-3 Communications Holdings, Inc., through its subsidiaries, provides command, control, communications, intelligence, surveillance, and reconnaissance (C3ISR) systems; and aircraft modernization and maintenance, and government services primarily in the United States. Its C3ISR segment offers fleet management sustainment and support, including procurement, systems integration, sensor development, modifications, and periodic depot maintenance for signals intelligence and ISR special mission aircraft, and airborne surveillance systems; strategic and tactical signals intelligence systems; secure data links; secure terminal and communication network equipment and encryption management; and communication systems. The company’s Government Services segment provides communication software support, information technology services, and various engineering development services and integration support; engineering and information systems support services; teaching and training services; human intelligence support and other services; aviation and maritime services; and technical and management services. L-3 Communications’ Aircraft Modernization and Maintenance segment offers modernization, upgrades and sustainment, maintenance, and logistics support services for military and various government aircraft and other platforms. The company’s Specialized Products segment provides power and control systems, microwave components, training and simulation, electro-optic/infrared products, precision engagement, security and detection systems, propulsion systems, undersea warfare products, and telemetry products. Its customers include the U.S. Department of Defense and its prime contractors, the U.S. Government intelligence agencies, the U.S. Department of Homeland Security, the U.S. Department of State, the U.S. Department of Justice, allied foreign governments, and other U.S. federal, state, and local government agencies. The company was founded in 1997 and is based in New York, New York.