Strategic Sub & Weapons System Support

The Strategic Submarine & Weapon Systems Support (PE 0101221N) program element is a cornerstone of the Navy's nuclear deterrence mission, focusing on the research, development, test, and evaluation (RDT&E) of submarine-launched ballistic missile (SLBM) systems. This program supports the modernization and sustainment of the SLBM leg of the nuclear triad, which accounts for a significant portion of the deployable U.S. nuclear inventory and is considered the most survivable component. The overarching goal is to ensure the continued credibility, reliability, and adaptability of the sea-based strategic deterrent, underpinning both national defense and the security commitments to U.S. allies.

Technical Applications Programs (2228) encompass two major initiatives: Trident II D5 Modernization (D5LE2) and the Threat & Risk-Informed Advanced Development (TRIAD) program. D5LE2 aims to upgrade the Trident II missile system for deployment on COLUMBIA-class submarines through 2084, addressing aging components and obsolescence. Key objectives include developing radiation-hardened electronics, advanced guidance systems, and modular architectures for future adaptability. TRIAD, launching in FY 2026, coordinates advanced R&D to proactively address emerging threats, focusing on areas such as position and accuracy, advanced materials, expanded launch area, increased targeting flexibility, and supporting infrastructure. These efforts are managed in collaboration with agencies including the Air Force Nuclear Weapons Center, Missile Defense Agency, and Naval Research Establishment.

W-93 / Mk 7 (3097) is a new warhead development program designed to provide the Navy with a third SLBM warhead variant, enhancing flexibility and resilience in the nuclear stockpile. The W93/Mk7 incorporates advanced technologies to meet evolving STRATCOM requirements and is structured to allow modifications in response to emerging threats. The program is executed jointly by the Department of Defense and Department of Energy/National Nuclear Security Administration under the Nuclear Weapons Lifecycle Process (Phase X). FY 2026 activities include flight tests, design maturation, hardware component testing, and risk reduction to support future production phases. The program also supports the U.K.'s independent nuclear deterrent and aims to revitalize the U.S. defense industrial base.

Integrated Nuclear Weapons Security Systems Development (3158) focuses on developing and fielding new technologies to secure nuclear assets across transit, air, cyber, and underwater domains. The primary objective is to counter emerging threats, including uncrewed systems (UxS), and to enhance the ability to deter, detect, delay, deny, and defeat adversaries. These RDT&E efforts support the Nuclear Weapons Surety program and the Transit Protection Program, with a particular emphasis on safeguarding TRIDENT Fleet Ballistic Missiles at strategic facilities and during transit. Investments target mitigating cybersecurity risks, improving electronic security systems, and ensuring continuity between nuclear weapon security and operational missions.

Congressional Adds (9999) provide targeted funding for specific research and technology demonstration efforts. In FY 2025, these include security monitoring at maritime chokepoints using passive seismic and hydroacoustic arrays to detect hostile submarines and unmanned underwater vehicles, enhancing SSBN protection during transits and port visits. Other adds support the development of next-generation strategic inertial measurement units for improved navigation and guidance, and multimodal biometric authentication to strengthen identity management and information security for strategic platforms. These initiatives supplement core program objectives by addressing identified capability gaps and advancing critical technologies.

The acquisition strategies across these budget lines leverage a mix of competitive and sole-source contracting, involving private industry, government laboratories, and Centers of Excellence. For major programs like D5LE2 and W93/Mk7, acquisition oversight is maintained by the Assistant Secretary of the Navy for Research, Development & Acquisition, ensuring alignment with statutory requirements and minimizing programmatic risk. Integration of new technologies is managed through established processes such as Strategic Systems Programs Alterations (SPALTs) and tailored acquisition approaches to meet both DoD and DOE/NNSA milestones.