20th MMS RAF Upper Heyford

The 20th Munitions Maintenance Squadron (20th MMS) was a United States Air Force unit stationed at RAF Upper Heyford in Oxfordshire, England, during the Cold War. The squadron was responsible for the storage, maintenance, and handling of conventional and nuclear munitions, supporting the 20th Tactical Fighter Wing’s operational readiness. Activated in the 1950s, the 20th MMS played a critical role in NATO’s deterrent posture against the Warsaw Pact by ensuring the rapid availability and safety of ordnance for F-111 aircraft. The unit remained active at Upper Heyford until the base’s closure and the withdrawal of USAF forces from the UK in the early 1990s.