The Air Force broke ground Feb. 13 on a prototype silo for the Northrop Grumman LGM-35A Sentinel future intercontinental ballistic missile at the company’s Promontory, Utah, site, officials said at the Air & Space Forces Association’s warfare symposium. The prototype is to allow engineers to test and refine modern construction techniques, validating the new silo design before work begins in the missile fields, the Air Force has said. The Sentine…
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