The 401st Equipment Maintenance Squadron (401 EMS) was a vital support unit within the United States Air Force, primarily assigned to the 401st Tactical Fighter Wing. Activated during the Cold War era, the squadron was originally stationed at Torrejon Air Base, Spain, where it played a crucial role in maintaining and repairing aircraft and ground equipment. The 401 EMS ensured the operational readiness of fighter jets such as the F-4 Phantom II and later the F-16 Fighting Falcon during numerous NATO and USAFE missions. The unit was inactivated following the closure of Torrejon AB in the early 1990s, marking the end of its distinguished service in Europe.