L-3 Communications Holdings, Inc. (L-3 Holdings) operates through its wholly owned operating subsidiary L-3 Communications Corporation (L-3 Communications). L-3 is a prime contractor in intelligence, surveillance and reconnaissance (ISR) systems, aircraft sustainment (including modifications, logistics and maintenance), simulation and training, night vision and image intensification equipment, enterprise and mission information technology (IT) solutions, and cyber operations. L-3 also provides a range of communication and electronic systems and products used on military and commercial platforms. It operates in four segments: Electronic Systems, Aerospace Systems, Communication Systems and National Security Solutions (NSS). Its customers include the United States Department of Defense and its prime contractors, the United States Government intelligence agencies, the United States Department of Homeland Security, foreign Governments, and domestic and international commercial customers.