Ground Based Strategic Deterrent The Ground Based Strategic Deterrent is a US land-based intercontinental ballistic missile system in the early stages of development , slated to replace all 450 Minuteman III missiles in service with the United States Air Force from 2027 onward.History A request for proposal for development and maintenance of a next-generation nuclear ICBM was made by the US Air Force Nuclear Weapons Center , ICBM Systems Directorate, GBSD Division in July 2016. The GBSD would replace the Minuteman III in the land based portion of the US nuclear triad . The new missiles, to be phased in over a decade from the late 2020s, are estimated over a fifty-year life cycle to cost around $86 billion. Boeing and Northrop Grumman competed for the contract. In August 2017, the Air Force awarded 3-year development contracts to Boeing and Northrop Grumman for $349 million and $329 million, respectively. One of these companies was to be selected to produce a ground-based nuclear ICBM in 2020. In 2027, the GBSD program is expected to enter service and remain active until 2075. On 25 July 2019, Boeing announced it would not place a bid for the program , citing Northrop's recent acquisition of Orbital ATK , Boeing's supplier of solid rocket motors. Northrop signed an agreement to firewall Boeing's proprietary data after acquiring Orbital ATK. The Air Force has since halted funding for the Boeing project, leaving only Northrop Grumman as a bidder. In December 2019 , it was announced that Northrop Grumman won the competition to build the future ICBM. Northrop won by default, as their bid was the only bid left to be considered for the GBSD program. The Air Force said that they will "proceed with an aggressive and effective sole-source negotiation" in reference to Northrop's bid.Warhead In March 2019 the W87 mod 1 thermonuclear warhead was selected for GBSD, replacing the W78 warhead currently used in Minuteman III. It is unclear if the W78 will be fitted to GBSD or if some other arrangement such as moving W87-0s to GBSD first will be made, but the estimated first production unit date was moved to 2030, a delay from the initial estimated entry into service date of 2027.
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