Keel laid for first Columbia-class ballistic missile submarine

General Dynamics Electric Boat conducted a keel-laying ceremony for the first Columbia-class ballistic-missile submarine, USS District of Columbia (SSBN 826) at Quonset Point, Rhode Island, on 4 June 2022. District of Columbia will be the first of a 12-boat class, which will replace 14 US Navy Ohio-class nuclear-powered ballistic submarines from 2027 onwards. The transition […]