Headquartered in Bethesda, Maryland, the Lockheed Martin Corporation is a global security and aerospace company. The company conducts research, design, development, manufacture, integration, and sustainment of technology systems, products, and services worldwide. The company operates through four segments, namely Aeronautics, Missiles and Fire Control, Rotary and Mission Systems, and Space, and primarily serves the U.S. government, as well as foreign military sales contracted through the U.S. government.