L-3 Communications Holdings, Inc. provides command, control, communications, intelligence, surveillance, and reconnaissance (C3ISR) systems; aircraft modernization and maintenance; and government services in the United States and internationally. Its C3ISR segment offers fleet management sustainment and support, such as 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; human intelligence support 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. Its Electronic Systems segment provides power and control systems, electro-optic/infrared products, microwave components, avionics and displays, simulation and training, precision engagement, security and detection, propulsion systems, telemetry and advanced technology, undersea warfare, and marine services. The company serves 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. L-3 Communications was founded in 1997 and is based in New York, New York.