The 851st Strategic Missile Squadron is an inactive United States Air Force unit. It was last assigned to the 456th Strategic Aerospace Wing, stationed at Beale Air Force Base, California. It was equipped with the HGM-25A Titan I intercontinental ballistic missile, with a mission of nuclear deterrence. It was the last Titan I squadron to achieve alert status on 1 February 1961. The squadron was inactivated as part of the phaseout of the Titan I on 25 March 1965.

The 456th Bombardment Wing is an inactive United States Air Force unit. It was last assigned to the 14th Air Division of Strategic Air Command at Beale Air Force Base, California, where it was inactivated on 30 September 1975. The wing's predecessor was the 456th Bombardment Group, a World War II United States Army Air Forces combat organization that flew from Italy while assigned to Fifteenth Air Force. It earned two Distinguished Unit Citations for valor in combat and participated in the strategic bombing campaign against oil production targets including those near Ploiești, Romania, attacks that resulted in high bomber losses. The group also served as a troop carrier unit in the Air Force Reserve from 1947 to 1949 and as the flying element of the wing from 1952 to 1955.