Shown is an illustration of the LGM-35A Sentinel launch silo, the Air Force’s newest weapon system known as the Ground Based Strategic Deterrent. The Air Force determined the LGM-35A Sentinel would provide continuity in strategic deterrence and cost less than extending the life of the current intercontinental ballistic missile fleet, comprised of the aging Minuteman III. Replacing the 1970s-era missile modernizes the ground-based leg of the nuclear triad and brings the Minuteman’s more than 50 years of service to a close. (U.S. Air Force illustration)
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