Northrop Grumman and USAF accelerate Sentinel ICBM silo prototyping after Promontory modular-silo test
Northrop Grumman and the U.S. Air Force have accelerated prototyping of the LGM-35A Sentinel launch-silo tube with a Promontory, Utah proof-of-concept test and broke ground on a modular prototype silo. Trials with Bechtel support aim to validate scalable construction as the program pushes toward initial capability in the early 2030s.