The 565th Strategic Missile Squadron (565 SMS) is an inactive United States Air Force unit. It was last assigned to the 389th Strategic Missile Wing, stationed at F. E. Warren AFB, Wyoming. On 15 August 1959, the 565th Strategic Missile Squadron (ICBM-Atlas) was the second Strategic Air Command (SAC) Intercontinental ballistic missile (ICBM) squadron to go on operational alert status, being equipped with the first-generation SM-65D Atlas, with a mission of nuclear deterrence. The squadron was inactivated as part of the phaseout of the Atlas ICBM on 25 March 1965.