The 509th Missile Squadron is an inactive United States Air Force unit. It was last assigned to the 351st Operations Group at Whiteman Air Force Base, Missouri. The squadron was equipped with the LGM-30F Minuteman II Intercontinental ballistic missile with a mission of nuclear deterrence. With the end of the Cold War, the 509th was inactivated on 28 July 1995. From 1947 to 1949, the squadron was active as a reserve unit, but does not appear to have been fully manned or equipped. It remained inactive until 1963, when it was activated at Whiteman as the 509th Strategic Missile Squadron.