The 564th Missile Squadron is an inactive United States Air Force unit. It was last assigned to the 341st Operations Group at Malmstrom Air Force Base, Montana, where it was inactivated on 19 August 2008. The squadron was reactivated in July 1958 as the 564th Strategic Missile Squadron. On 1 December 1958, it was the first Air Force intercontinental ballistic missile squadron to go on nuclear alert status. It was inactivated in 1964 with the phase out of the SM-65D Atlas missile.