Defense contractor General Dynamics Corporation has a global presence as it operates across four segments - Aerospace, Marine Systems, Combat Systems, and Technologies. The Aerospace segment offers various aviation services, including aircraft maintenance, repair, management, and staff, in addition to the production and sale of business jets. The Marine Systems segment designs and manufactures submarines, surface combatants, and auxiliary ships for the United States Navy, as well as crude oil and product tankers, container ships, and cargo ships for commercial clients. The Combat Systems segment specializes in land combat solutions, such as armored vehicles, weapons systems, and munitions. Finally, the Technologies segment provides information technology solutions and mission support services and unmanned undersea vehicle manufacturing and assembly services. General Dynamics Corporation has been in existence since 1899 and is headquartered in Reston, Virginia.