The 509th Munitions Maintenance Squadron (509th MMS) was a United States Air Force unit assigned to the 509th Bombardment Wing at Pease Air Force Base, New Hampshire. Established during the Cold War, the squadron was responsible for the storage, maintenance, and readiness of nuclear and conventional munitions for the wing's strategic bomber fleet. The 509th MMS played a key role in supporting the wing’s mission, ensuring that munitions were safely managed and readily available for B-52 Stratofortress operations. The squadron was inactivated as part of realignments following the end of the Cold War and changes in U.S. nuclear strategy.