Development of Missile-X (later Peacekeeper) begins
Peacekeeper missile, LGM-118.
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1979: President Carter made the decision to proceed with full scale engineering development of the Missile-X. The President augmented this decision on 7 September 1979 with the selection of a horizontal multiple protective shelter basing plan for the new missile. Full scale engineering development began one week later. Peacekeeper production began in February 1984.
Under plans prepared by Strategic Air Command, 50 Minuteman IIIs assigned to the 400th Strategic Missile Squadron, 90th Strategic Missile Wing, F.E. Warren AFB, Wyoming, would be removed and replaced with Peacekeeper missiles, which had an estimated service life of twenty years. Peacekeeper deployment was scheduled to begin in January 1986 and initial operational capability was set for December of the same year.