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Source: 341st Missile Wing LGM-30 Minuteman missile launch sites

This is a list of the LGM-30 Minuteman missile" target="_blank">missile missile" target="_blank">Missile Alert Facilities and Launch Facilities of the 341st missile" target="_blank">Missile Wing, 20th Air Force, located at Malmstrom AFB, Montana.
The wing was the first United States Air Force LGM-30 Minuteman ICBM wing. On 15 July 1961, the 341st Strategic missile" target="_blank">Missile Wing was reactivated, and a year later, in late July 1962, the first LGM-30A Minuteman I arrived and was placed at the Alpha-9 launch facility. The 10th SMS accepted its final flight on 28 February 1963. Two months later, the 12th SMS became 100 percent combat ready. In July, the 490th SMS became fully operational, giving the 341st SMW responsibility for 150 silos. A fourth squadron, the 564th, a former SM-65D Atlas unit, stood up on 1 April 1966 with the LGM-30F Minuteman II.
Beginning in 1967, all Minuteman I A and B models were replaced by the Minuteman II. The upgrade was completed by June 1969. In 1975, the 564th SMS switched from the Minuteman II to the LGM-30G Minuteman III model.
On 28 September 1991, President Bush ordered all Minuteman IIs off alert status. This order affected three-quarters of the 200 ICBMs stationed at Malmstrom. From 1992 to 1994, the Air Force removed 150 Minuteman II missiles from their silos to comply with the pending START I Treaty. The 10th, 12th and 490th silos were upgraded to receive Minuteman III missiles, joining the 50 Minuteman III missiles already on alert status with the 564th.
In 2007 the 564th SMS's 50 silos were retired to reduce operating costs. They were last upgraded in the early 1970s and were considerably different from the newer Minuteman III silos upgraded in the 1990s. With their inactivation, the United States number of ground-based ICBMs was reduced to 450.