Navy’s Proposed Battleship Fleet Could Cost $275 Billion for 15 Ships
$275 billion is the Congressional Budget Office’s estimate for building the Navy’s proposed 15-ship Trump-class fleet through 2056. The lead ship, USS Defiant, accounts for an estimated $23.4 billion, while each of the 14 follow-on vessels would average about $18 billion. Those figures make the proposal a test not only of congressional willingness to fund it, but also of whether the U.S. nuclear shipbuilding base can absorb another large and specialized program.
The published cost assessment rests on several assumptions: The first ship would be ordered in 2028, the Navy would purchase 15 through 2056, multiple yards could construct sections, and one shipyard would handle final assembly. The design remains at an early stage, so the estimate is highly uncertain and could move as displacement, propulsion integration, labor requirements and construction strategy become clearer.
The $455 billion figure describes a different fleet
The $275 billion estimate applies to the 15 ships in the Navy’s current long-range plan. A separate figure of roughly $455 billion is an extrapolation for a possible 25-ship force, the upper end of a stated 20-to-25-ship goal. It should not be presented as CBO’s estimate for the current 15-ship proposal.
That distinction matters because neither figure represents a complete lifetime ownership bill. The estimates concern procurement, while a nuclear fleet would also require specialized training, maintenance, shore support and eventual decommissioning. Nuclear propulsion could eliminate purchases of conventional fuel and reduce some operating costs, but CBO did not have enough design information to calculate those potential savings.
Nuclear propulsion buys endurance at a substantial acquisition cost
The proposed ships would use A1B nuclear reactors rather than conventional engines. CBO estimated that a conventionally powered 15-ship class would cost about $243 billion, making the nuclear version approximately 13% more expensive to acquire. That is roughly $32 billion added across the program before uncertain operating savings are considered.
Propulsion cannot be treated as a simple engine substitution. A nuclear plant affects hull arrangement, shielding, safety validation, qualified staffing, maintenance planning and the supply chain for reactor components. Adapting the system to a new surface-combatant design would require substantial engineering even if it shares technology with an existing aircraft carrier reactor.
Ship size compounds the integration challenge. The public design assumptions describe a vessel displacing more than 35,000 tons, capable of speeds above 30 knots and carrying as many as 850 sailors. A larger hull can provide space, electrical power and cooling for major sensors and future systems, but it also increases structural material, labor hours and shipyard workload. If the design grows, the cost and schedule assumptions would need to move with it.
An eight-year build depends on scarce industrial capacity
USS Defiant could take more than eight years to construct. Even that schedule depends on a stable design, predictable appropriations, available reactor components and enough skilled workers to keep module production and final assembly synchronized.
The central constraint is that nuclear-certified shipbuilding capacity is not interchangeable with ordinary commercial-yard capacity. U.S. yards already face worker shortages and competing demands from carrier, submarine, destroyer and maintenance programs. Distributing module work among several facilities could broaden participation, but it would also add interface management, transportation, quality-control and schedule-coordination requirements. Final nuclear integration would remain concentrated in a much narrower industrial base.
CBO estimated that the Navy’s latest plan would raise average annual funding for surface-combatant procurement from about $11 billion to $19 billion. By 2035, shipbuilders would need to more than double the tonnage of large surface combatants produced under the previous plan; across the full planning period, large-combatant tonnage would rise about 60%.
That creates a direct tradeoff for Congress and taxpayers. Funding and skilled labor assigned to one large program cannot simultaneously build or maintain other ships. The proposal could support shipyard hiring and supplier investment if orders remain steady, but irregular appropriations or design changes could leave yards carrying specialized costs without the stable production rhythm needed to reduce them.
No ship is under construction, and congressional authorization and funding are still required. Predictions that the program will be canceled remain forecasts, while proposals to limit it to three ships are commentary rather than Navy policy. The next consequential decisions are therefore design maturity, propulsion integration and appropriations not the promotional claims surrounding the fleet. Until those decisions establish a buildable configuration and credible yard plan, $275 billion remains both a cost estimate and a measure of the industrial expansion the proposal would demand.
By David Whitaker — Associate editor for AMI’s aerospace and drone systems desk, translating flight systems, aircraft programs, spaceflight, and UAV developments into accessible technical stories.
