401st FMS

The **401st Field Maintenance Squadron (401st FMS)** was a unit of the United States Air Force, originally activated as part of the 401st Fighter Wing. Established during the Cold War, it provided vital aircraft and equipment maintenance support to fighter operations, ensuring mission readiness and operational effectiveness. The squadron was stationed at several locations, most notably at Torrejon Air Base in Spain, where it supported USAFE (United States Air Forces in Europe) missions. The 401st FMS played a crucial role in maintaining the wing's fighter aircraft, such as the F-4 Phantom II and later the F-16 Fighting Falcon, before it was inactivated or redesignated during subsequent Air Force reorganizations.