Lockheed Martin Corporation is a security and aerospace company. It operates through four segments. Aeronautics segment is engaged in the research, design, development, manufacture, support and upgrade of military aircraft, including combat and air mobility aircraft, unmanned air vehicles and related technologies. Missiles and Fire Control segment provides air and missile defense systems; fire control systems; manned and unmanned ground vehicles, and energy management solutions. Rotary and Mission Systems segment provides design, manufacture, service and support for various military and commercial helicopters, surface ships, sea and land-based missile defense systems, radar systems, sea and air-based mission and combat systems, command and control mission solutions, cyber solutions, and simulation and training solutions. Space segment is engaged in the research and development, design, engineering and production of satellites, missile systems and space transportation systems.