By the 1970s, 1,000 Minuteman missiles were deployed. This force has shrunk to 400 Minuteman III missiles , deployed in missile silos around Malmstrom AFB, Montana; Minot AFB, North Dakota; and Francis E. Warren AFB, Wyoming. The Minuteman III will be progressively replaced by the new LGM-35 Sentinel ICBM, to be built by Northrop Grumman, beginning in 2030.
By the 1970s 1000 Minuteman missiles were deployed This force has shrunk to 400 Minuteman III missiles  deployed in missile silos around Malmstrom AFB Montana; Minot AFB North Dakota; and Francis E Warren AFB Wyoming The Minuteman III will be progressively replaced by the new LGM-35 Sentinel ICBM to be built by Northrop Grumman beginning in 2030