US Navy awards $743 million for SLCM-N nuclear cruise missile to improve deterrence against Russia and China.

The U.S. Navy's Strategic Systems Programs awarded five prototype agreements valued at $743.57 million to advance the Nuclear-Armed Sea-Launched Cruise Missile program. These contracts task major defense contractors with designing and testing missile flight-integration systems and launch canisters compatible with Virginia-class attack submarines. The program aims to field a non-strategic sea-based deterrent to address regional low-yield nuclear capabilities held by adversaries like Russia and China.

The SLCM-N is a new nuclear-armed cruise missile intended to restore the U.S. submarine-launched nuclear strike capability previously provided by the TLAM-N, a nuclear Tomahawk missile withdrawn from operational deployment in 1992 and retired in 2013. (Picture source: US DoD)

On October 6, 2026, the U.S. Navy's Strategic Systems Programs (SSP) announced five prototype agreements worth $743,567,499.68 for the Nuclear-Armed Sea-Launched Cruise Missile (SLCM-N), advancing the development of a nuclear cruise missile intended to counter potential adversaries who possess regional low-yield tactical nuclear capabilities, like Russia or China. Primarily intended for Virginia-class attack submarines and Trump-class battleships, the SLCM-N would fill a deterrence gap after the Tomahawk Land Attack Missile-Nuclear (TLAM-N) was retired in 2013. Awarded on September 23, the agreements cover three development teams to compete in developing the actual missile and its flight-integration systems (Leidos subsidiary Dynetics, Raytheon, and Northrop Grumman), as well as two launch-canister suppliers (Northrop Grumman Mission Systems and Pacific Engineering), with work scheduled through December 31, 2027.

These awards task the contractors with designing and prototyping the SLCM-N Launcher Subsystem, which will be physically integrated with the U.S. Navy's Virginia Payload Tubes (VPTs) and be connected with the Virginia-class submarine’s shipboard systems, providing a nuclear strike option separate from the Trident II D5 ballistic missiles carried by Ohio-class submarines. These awards follow the August 22, 2025, selection of Leidos, Raytheon, Lockheed Martin, Northrop Grumman, and Florida Turbine Technologies for preliminary development. The U.S. Navy also committed $26.24 million to earlier launcher-and-canister development, $194.1 million to General Dynamics on September 3, 2026, for fire-control subsystem engineering through September 2028, and $47.4 million to JRC Integrated Systems on September 17 for integration, modeling, simulation, and flight-test engineering extending into 2030. The combined announced value of these nine SLCM-N contracts now reaches $1,105,907,499.68 ($1.106 billion), although some actions are contract modifications and potential overlaps may not have been reconciled.

Related topic: U.S. Congress approves deployment of SLCM-N nuclear cruise missiles on Trump-class battleships

The Nuclear-Armed Sea-Launched Cruise Missile (SLCM-N) will be equipped with the W80-5 nuclear warhead, following earlier plans to adapt the W80-4 developed for the AGM-181 Long-Range Standoff (LRSO) missile, although FY2025 legislation permits an alternative nuclear payload. The W80 family, with selectable yields of approximately 5 and 150 kilotons of TNT equivalent, previously equipped nuclear Tomahawk and AGM-86 cruise missiles, whereas the W76-2 lower-yield warhead has served aboard Trident II D5 missiles since 2020. The Trident II D5, which follows a ballistic trajectory, measures 13.41 meters long, 2.11 meters in diameter, weighs 58,500 kilograms, and has a range exceeding 7,000 kilometers. The SLCM-N instead uses an underwater launch booster followed by powered atmospheric flight, allowing the use of programmed approach routes but exposing the missile to aircraft, ground-based radars, and surface-to-air missiles. Its final range, speed, dimensions, weight, nuclear yield, and flight profile remain unconfirmed, preventing direct performance comparisons with the Trident or assessments of its ability to penetrate Russian and Chinese defenses.

The submarine integration requirement is centered on the Virginia Payload Tube (VPT), a large-diameter launcher measuring 87 inches (2.21 meters) across, rather than the smaller individual vertical-launch cells used on earlier attack submarines. Virginia-class Block III and Block IV submarines use two large-diameter bow payload tubes, each capable of accommodating six Tomahawk cruise missiles, while Block V introduces an additional 84-foot (25.6-meter) Virginia Payload Module containing four more large-diameter tubes, increasing maximum Tomahawk capacity to 40 missiles. For the SLCM-N, the U.S. Navy is therefore developing a complete All-Up Round (AUR) incorporating the nuclear-armed missile, an expendable launch booster, and the equipment required to initiate submerged launch, all housed in a Multiple All-Up Round Canister compatible with these payload tubes. The number of nuclear missiles per canister remains undetermined, so the conventional Tomahawk capacity cannot be treated as the submarine's future SLCM-N capacity. Integration must also connect missile navigation, mission planning, and launch authorization functions to the submarine's fire control architecture, while accommodating nuclear safety requirements at Kings Bay, Georgia, and Bangor, Washington, as well as environmental conditions associated with underwater launch.

The SLCM-N is intended to restore the nuclear deterrence mission previously performed by the Tomahawk Land Attack Missile-Nuclear (TLAM-N), introduced during the mid-1980s with a W80-0 warhead and a range of 2,500 km. In September 1991, President George H. W. Bush announced the withdrawal of sea-based tactical nuclear weapons under the Presidential Nuclear Initiatives, and the Navy removed TLAM-Ns from operational deployment by mid-1992. However, the U.S. Navy retained a potential redeployment capability until permanently retiring the weapon in 2013. The 2018 Nuclear Posture Review subsequently proposed the SLCM-N alongside the W76-2 lower-yield Trident warhead, assigning the latter to the near-term requirement and the cruise missile to a longer-term regional nuclear mission. The 2022 Nuclear Posture Review reversed this decision and proposed cancelling the SLCM-N project, with the Navy calculating $199.2 million in FY2023 savings and $2.1 billion over five years. Unlike the TLAM-N, the SLCM-N is being developed as a separate weapon with new launch-canister arrangements, fire control interfaces, and nuclear certification requirements, while the final configuration must be compatible with the Virginia-class submarine architecture developed after the original nuclear Tomahawk entered service.

The Congress has progressively increased the SLCM-N funding despite the proposed cancellation, appropriating $25 million for the missile and $20 million for its warhead in FY2023, followed by $130 million and $70 million in FY2024. FY2025 legislation authorized $252 million and $70 million, respectively, while reconciliation legislation P.L. 119-21 provided $2 billion for missile acceleration and $400 million for the warhead. FY2026 legislation separately authorized $210 million and $50 million. Following the program's December 2025 start milestone, the acquisition schedule calls for system development in September 2028, a low-rate production decision in September 2031, operational testing beginning in October 2033, and a full-rate production decision in June 2034. Congress nevertheless requires limited deployment by September 2032, 13 months before the scheduled start of operational testing. The Congressional Budget Office estimated $10 billion in missile and warhead costs during 2023-2032, assuming a 2024 program start, excluding later production, integration, storage, and operating costs.

The submarine force expected to support the SLCM-N missile is also undergoing a reduction in nominal strategic ballistic missile launch capacity during the Ohio-to-Columbia transition. Ohio submarines originally carried 24 Trident launch tubes each, subsequently reduced to 20 operational tubes, producing 280 across the fleet. Each Columbia-class submarine will carry only 16 tubes, reducing the nominal capacity to 192, a loss of 88 tubes (31.4%). Moreover, the lead vessel, the USS District of Columbia (SSBN-826), has faced construction delays involving industrial capacity and critical components, although the Navy seeks an annual production of two Virginia-class submarines and one Columbia-class submarine. The SLCM-N could distribute nuclear weapons aboard attack submarines without using Trident tubes, but would not replace the strategic deterrence mission of the Trident II D5. Its installation would also compete with conventional Tomahawk missiles and other payloads, while nuclear certification and maintenance could further reduce the Virginia-class submarine availability. Nuclear certification, specialized weapons loading, and additional training could also affect maintenance schedules and deployment availability.

The operational rationale behind the SLCM-N is to add a non-ballistic nuclear response from the U.S. against limited nuclear threats from Russia and China, without requiring nuclear-capable strategic bombers to deploy from vulnerable regional bases. Russia maintains a substantial inventory of nonstrategic nuclear weapons, including weapons deliverable by air, ground launchers, and naval assets, creating potential scenarios in which Moscow might threaten limited nuclear use against NATO forces or European territory. Therefore, the SLCM-N could provide a response option from U.S. submarines already operating at sea. In the Indo-Pacific, China's expanding nuclear forces, its growing submarine fleet, and its integrated coastal surveillance and air defense networks create a different constraint.

The effectiveness of a submarine-launched nuclear cruise missile would depend on whether U.S. attack submarines could reach suitable launch areas while remaining undetected and whether the missile could penetrate defenses protecting its intended target. Nuclear weapons aboard multipurpose attack submarines would also increase the risk of misinterpreting launches during a crisis, because Russia or China might be unable to determine whether a submarine movement or cruise missile launch involved a conventional or nuclear mission. A small force of U.S. nuclear-capable attack submarines could provide an additional retaliatory option, but would not fundamentally change the strategic nuclear balance with Russia or China, compensate for the reduction in Trident launch tubes, or guarantee the SLCM-N' suitability against certain defended or time-sensitive targets.

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Written by Jérôme Brahy

Jérôme Brahy is a defense analyst and documentalist at Army Recognition. He specializes in naval modernization, aviation, drones, armored vehicles, and artillery, with a focus on strategic developments in the United States, China, Ukraine, Russia, South Korea, Türkiye, and Belgium. His analyses go beyond the facts, providing context, identifying key actors, and explaining why defense news matters on a global scale.