616 Tomahawk missiles sit behind one uncomfortable calendar reality: the U.S. Navy’s four Ohio-class guided-missile submarines are moving toward retirement between 2026 and 2028, and no one-for-one replacement exists for what those boats bring in sheer concentrated strike capacity.
That matters because these submarines were never ordinary attack boats with extra room. USS Ohio, USS Florida, USS Michigan, and USS Georgia were converted into stealthy conventional strike platforms that can each carry 154 Tomahawks, support special operations teams, and remain deployed for unusually long periods. In engineering terms, they are a rare combination of magazine depth, endurance, and flexibility. In force-structure terms, they are the Navy’s largest conventional missile batteries that happen to operate underwater. The replacement path is real, but it is not symmetrical.
The Navy’s answer is the Block V Virginia-class submarine with the Virginia Payload Module, an added hull section that boosts each boat to 40 Tomahawks using an 80-foot Virginia Payload Module. That is a meaningful jump from earlier Virginias, and it comes with modern sensors, strong integration across the kill chain, and a design better aligned with distributed operations. But four SSGNs disappearing removes a concentrated salvo that multiple Block V boats must spread across more hulls, more patrol cycles, and more production risk.
The core issue is not whether the Virginia class is capable. It is whether enough of them arrive fast enough. The submarine industrial base is already carrying the burden of sustaining Virginia production while the Columbia-class ballistic-missile submarine program remains the Navy’s top shipbuilding priority. According to a December 2025 CRS report, the lead Columbia boat is carrying an estimated 17-month delivery delay, while the same industrial base must still support desired Virginia output. That overlap turns the SSGN retirement problem into a shipyard and supplier problem as much as an undersea warfare problem.
The engineering tradeoff is stark. The Ohio SSGNs are aging hulls from the 1980s, and several analyses point to reactor life, maintenance load, and hull fatigue as hard constraints rather than bookkeeping choices. They have already served beyond their original expectations. Keeping them longer would demand more sustainment of electronics, computing, weapons systems, and the hull itself. Retiring them, however, pushes the Navy toward a more distributed model in which firepower is more survivable across many submarines but less concentrated on any single hull.
That shift changes how undersea strike is delivered. An Ohio SSGN can appear off a coastline with the kind of missile inventory normally associated with a surface group, while also serving as a clandestine platform for special operations forces. Rear Adm. Thomas Wall once described that mix succinctly: “Submarines like USS Ohio provide the U.S. Navy with unprecedented strike and special operation mission capabilities from a stealth, clandestine platform.” The quote captures why the retirement debate persists. The question is not simply how many missiles fit in future tubes. It is how much capability disappears when one submarine can no longer do the work of several. The result is a narrowing transition window. The Navy is not losing undersea strike altogether. It is losing a class built around mass. And mass, especially underwater, is not easy to rebuild on schedule.
