320th Missile Squadron The 320th Missile Squadron ( 320 MS ) is a United States Air Force unit . It is assigned to the 90th Operations Group , stationed at F . E . Warren AFB , Wyoming . The 320 MS is equipped with the LGM - 30G Minuteman III Intercontinental ballistic missile ( ICBM ) , with a mission of nuclear deterrence . History . World War II . Activated in spring 1942 as a B - 26 Marauder medium bomber squadron . Trained under Third Air Force in southeastern United States . Reassigned to Michigan where squadron received Very Long Range ( VLR ) B - 24D Liberator heavy bombers manufactured by Ford specifically for extended length missions over the Pacific . Squadron deployed first to Hawaii and trained on the heavy bombers for combat and long over ocean navigation and bombardment missions under Seventh Air Force . Squadron deployed to Fifth Air Force in Southwest Pacific Area ( SWPA ) , assembling in northern Queensland , Australia then moving to operational base in Papua New Guinea . From airfields in New Guinea , the squadron carried out long - range strategic bombardment of enemy targets in New Guinea , Dutch East Indies , Philippine Islands and other areas from bases as ground forces sized them during MacArthur ' s island hopping campaign . Bombarded enemy targets on Okinawa ; Iwo Jima ; Formosa and eastern China , eventually being stationed on Ie Shima preparing for VLR bombardment operations over the Japanese Home Isands when the Japanese Capitulation occurred in August 1945 . Squadron personnel demobilized in Okinawa and Philippines , aircraft sent to reclamation during fall of 1945 . Inactivated as a paper unit in Early 1946 . Strategic Air Command . The squadron was active but unmanned from , 1 July 1947 – 1 September 1948 . Brought to operational status under Strategic Air Command in 1951 , being equipped with RB - 29 Superfortress es at Fairchild AFB , Washington . Moved to Forbes AFB , Kansas shortly afterward and conducted operational training from , 1 June 1951 – September 1952 , replacement training from , 1 June 1951 – 1 September 1953 , and . SHORAN training from , 10 November 1952 - 30 Novovember 1953 Replaced the propeller - driven RB - 29s with new RB - 47E Stratojet swept - wing reconnaissance bombers in 1954 , capable of flying at high subsonic speeds and primarily designed for penetrating the airspace of the Soviet Union . Flew many long - range clandestine missions with the RB - 47 , flying many ferret missions around the periphery of Soviet territory , and sometimes inside on penetration flights to map planned routes for B - 52s if combat missions over the Soviet Union ever became necessary . Began performing RB - 47 crew training from , c . 1 January 1959 – 20 June 1960 . Began phasing down RB - 47 missions in 1959 when the vulnerability of the aircraft to Soviet air defenses became evident , was inactivated on 20 June 1960 . Intercontinental Ballistic Missile Squadron . Reactivated on 8 January 1964 as an ICBM squadron assigned to the 90th Missile Wing at Francis E . Warren AFB , Wyoming . The squadron was initially equipped with 50 LGM - 30B Minuteman I s in early 1964 . In 1973 / 1974 the squadron upgraded to LGM - 30G Minuteman III ICBMs which are still on alert as of today .