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Ohio-class
The United States Navy’s sea-based strategic deterrent — 14 nuclear-powered ballistic-missile submarines carry
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Columbia class
The Columbia class is the US Navy's next ballistic-missile submarine — 12 boats replacing 14 Ohios, with electric drive, an X-stern and a life-of-ship reactor. The $126B+ program is the Navy's top priority, running ~a year late with lead-boat delivery now targeted for 2028.