The Lockheed Martin Corporation, formed by the merger of Lockheed Corporation and Martin Marietta in 1995, is a leading global player in the aerospace, military support, security, and technologies industry. As of January 2022, it employs around 115,000 personnel worldwide, with about 60,000 in engineering and scientific roles, and is the largest defense contractor globally by revenue since 2014, with 78% of revenue in 2013 driven by military sales. Operating in four key segments - Aeronautics, Missiles and Fire Control, Rotary and Mission Systems, and Space - Lockheed Martin is notably engaged in the development of the F-35 Lightning II, serves as the lead for the USAF Space Fence, and primary contractor for the Orion command module, while also investing in sectors like healthcare systems, renewable energy, intelligent energy distribution, and compact nuclear fusion.