Lockheed Martin Corp. is a global security and aerospace company, which engages in the research, design, development, manufacture, integration, and sustainment of technology systems, products, and services. The company is headquartered in Bethesda, Maryland and currently employs 121,000 full-time employees. The firm is engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services. Its segments include Aeronautics, Missiles and Fire Control (MFC), Rotary and Mission Systems (RMS) and Space. Aeronautics segment is engaged in the research, design, development, manufacture, integration, sustainment, support and upgrade of advanced military aircraft. MFC segment provides air and missile defense systems, manned and unmanned ground vehicles, energy management solutions, and others. RMS segment designs, manufactures, services and supports various military and commercial helicopters, surface ships, sea and land-based missile defense systems, and others. Its Space segment is engaged in the research and design, development, engineering and production of satellites, space transportation systems, and strategic, advanced strike, and defensive systems.