The F-16 Fighting Falcon is an American multirole jet fighter aircraft developed by General Dynamics and Lockheed Martin for the United States Air Force. Designed as a lightweight fighter, it evolved into a successful multirole aircraft. The Falcon's versatility is a paramount reason it was a success on the export market, serving 24 countries. The F-16 is the largest Western fighter program with over 4,000 aircraft built since production started in 1976. Though no longer produced for the US Air Force, it is still produced for export.