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The new Navy Columbia-Class SSBNs will be the largest submarines ever built by the United States. Each of the planned dozen boats will be 560 feet in length and have a beam of 43 feet.
Beginning in 2031, the U.S. Navy will replace each of the retiring Ohio-class subs with a new Columbia-class SSBN. The program's goal is to build a dozen of the new nuclear-powered submarines, and those boats will continue to support the U.S. strategic deterrent mission.