The Ground-to-Air Pilotless Aircraft (GAPA) was a short-range surface-to-air missile (SAM) developed in the late 1940s by Boeing for the United States Army Air Forces, and then the United States Air Force after 1948. It was given the reference number SAM-A-1, the first Surface-to-Air Missile (SAM) in the 1947 tri-service designation system. By 1950, over 100 test rockets had been launched using a variety of configurations and power plants, with one launch in 1949 setting the altitude record for a ramjet powered vehicle at 59,000 ft (18,000 m).

Boeing Defense, Space & Security (BDS) is a division of The Boeing Company based in Arlington, Virginia, near Washington, D.C. The division builds military airplanes, rotorcraft, and missiles, as well as space systems for both commercial and military customers, including satellites, spacecraft, and rockets.