Lockheed Martin Corp. engages in the research, design, development, manufacture, integration, and sustainment of technology systems, products, and services. It operates through the following segments: Aeronautics, Missiles & Fire Control, Rotary & Mission Systems, and Space Systems. The Aeronautics segment is engaged in the research, design, development, manufacture, integration, sustainment, support and upgrade of advanced military aircraft, including combat and air mobility aircraft, unmanned air vehicles and related technologies. The Missiles & Fire Control segment provides air and missile defense systems; tactical missiles and air-to-ground precision strike weapon systems; logistics; fire control systems; mission operations support, readiness, engineering support and integration services; manned and unmanned ground vehicles, and energy management solutions. The Rotary & Mission Systems segment provides design, manufacture, service and support for a variety of military and commercia