A new Minuteman III post boost control system sits poised above the open silo of a 90th Missile Wing launch facility March 29. The 90th Missile Maintenance Squadron members have been replacing the PBCSs of their missiles with ones containing a new missile guidance system which extends the operational life of the missiles. The installation of this PBCS finishes the upgrading of Warren’s missiles. (U.S. Air Force photo by R. J. Oriez)
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