Arithmetic is not usually dramatic, but in naval force design it can redraw the map. The U.S. Navy is approaching a transition that is less about any single submarine than about what disappears when several aging platforms leave together. Four Ohio-class guided-missile submarines are scheduled to retire by 2027, and the Ticonderoga-class cruisers are also heading out of the fleet. Taken together, that means 2,080 vertical launch cells vanish from the Navy’s inventory, including the unusually dense strike capacity carried by the SSGNs. That loss matters because no replacement arrives with the same blend of stealth, magazine depth, and mission flexibility.
The Ohio-class boats occupy two very different roles, and that distinction is central to the Navy’s problem. The ballistic-missile submarines remain one of the most survivable legs of the U.S. nuclear triad, built around assured second-strike deterrence. The four converted SSGNs, by contrast, became conventional strike workhorses after the post-Cold War force reshaping of the 1990s. Each of those converted boats carries 154 Tomahawk missiles, giving the quartet 616 launch cells on their own. As Naval News’ Peter Ong wrote, “That gives a total of 1,464 VLS cells for the cruisers and 616 VLS cells for the SSGNs for a combined total of 2,080 VLS cells.”
That capacity is not just a matter of volume. It is also about access. The SSGNs can remain submerged for long periods, move into positions surface combatants cannot hold as easily, and support missions well beyond missile launch. The Navy has long used them to support special operations forces, with lock-out chambers, stowage for specialized gear, and the ability to embark 66 special operators. That makes the platform more than a missile truck. It is a covert strike and insertion asset wrapped into one hull.
The planned successor for undersea conventional strike is the Virginia-class Block V, fitted with the Virginia Payload Module. That extra hull section adds four large-diameter payload tubes and sharply expands missile capacity compared with earlier Virginias. The boats grow to roughly 140 meters long and 10,200 tons, making them the second-largest submarines the Navy has built after the Ohio class. They are also increasingly central to the Navy’s future attack-submarine force, especially as the Virginia class became the most numerous attack-submarine class in U.S. service.
Even so, the substitution is incomplete. The Virginia Payload Module improves strike density, but it does not replicate an Ohio SSGN’s 154-missile load. The Tomahawk itself remains the backbone of that conventional reach because it gives ships and submarines the ability to strike inland from standoff range, and later variants added in-flight retargeting and reconnaissance-oriented flexibility. But missile quality does not erase launcher scarcity. A smaller number of tubes still means fewer options for sustained salvos, distributed deployments, and overlapping mission sets.
The deeper issue is industrial, not conceptual. The Columbia-class program, intended to replace the Ohio ballistic-missile submarines, remains essential to nuclear deterrence, yet it has been weighed down by labor shortages, supplier strain, and schedule pressure. The Navy is also trying to build Virginia-class boats at the same time, while production has remained below the desired tempo and post-pandemic recovery across shipyards has been uneven. A modern submarine contains an enormous number of specialized parts, and the supplier base is now a strategic variable in its own right.
That is why extending aging Ohio hulls has become less a preference than a necessity. Until enough replacement capacity is actually in the water, retiring them on schedule would not simply close a chapter in submarine history. It would remove a large block of hidden, survivable firepower before the Navy has built a credible substitute.
