The United States has begun construction of a full-scale prototype launch silo for its next-generation Sentinel intercontinental ballistic missile, according to the U.S. Air Force.
Ground has been broken at Promontory, Utah, for the prototype, which is intended to validate a modular construction approach for up to 450 future silos planned under the LGM-35A Sentinel programme. The effort is being delivered in partnership with Northrop Grumman and Bechtel.
The prototype is designed to test a repeatable, standardised build process aimed at accelerating deployment and managing costs, while providing data to refine the final design ahead of full-rate production. The programme represents a shift away from refurbishing legacy Minuteman III infrastructure towards constructing new facilities.
“The new silo design delivers operationally relevant capability on a predictable cost and schedule,” said General Dale White. “We are accelerating delivery while ensuring the system is sustainable and ready for Airmen to operate for decades.”
The milestone follows a series of developments across the wider programme, including ongoing construction of a new command centre at F.E. Warren Air Force Base and testing of all propulsion stages of the missile. A flight test is currently planned for 2027 as the programme continues to mature.
“This prototype is a critical step in proving the design and reducing risk before production,” said Brigadier General William Rogers. “We are executing a disciplined acquisition strategy to deliver a fully integrated, operational weapon system on schedule.”
The Sentinel programme is intended to replace the Minuteman III system and is expected to deliver initial operational capability in the early 2030s.
