Trident D5 Life Extension (D5LE)
Primarily USA (development, testing); UK (operation) · 2002 (D5LE initiated) - 2042 (extended service life) · Not directly stated for UK, but US Navy awarded Lockheed Martin $383 million for D5LE2 in 2025, and $850.4 million for D5LE2 work through 2030.
The judgement call
Account-gated at launchThe D5LE program was initiated to ensure the continued credibility and survivability of the strategic deterrent. - Successful test launches demonstrate the effectiveness of the life extension efforts. - The program is a critical component of maintaining the UK's continuous at-sea deterrent (CASD) in conjunction with the Vanguard and Dreadnought class submarines.
Key engineering challenges
Replacing aging missile parts and electronics to extend operational life. - Ensuring continued reliability and accuracy of the ballistic missile system over an extended service period. - Integrating new technologies and components while maintaining compatibility with existing submarine platforms.
Project facts
- Client / owner
- US Navy, UK Royal Navy
- Lead contractor
- Lockheed Martin
- Lead designers
- Lockheed Martin
- Project type
- life extension / upgrade
- Scale
- Extends service life of Trident II D5 missiles from 30 to 44 years; 130,000-pound missile; travels 20,000 feet per second.
- Disciplines
- Missile engineering; propulsion; guidance systems; nuclear engineering; systems integration
- Standards & frameworks
- US and UK strategic weapons system standards.
Sources: Wikipedia: UGM-133 Trident II (https://en.wikipedia.org/wiki/UGM-133_Trident_II) - US Navy: Successful Trident II D5 Life Extension (D5LE) Launches... (https://www.navy.mil/Press-Office/News-Stories/display-news/Article/4312684/successful-trident-ii-d5-life-extension-d5le-launches-demonstrate-continued-rea/) - CSIS Missile Threat: Trident D5 (https://missilethreat.csis.org/missile/trident/) - Lockheed Martin: U.S. Navy Awards Lockheed Martin $383 Million for Next... (https://investors.lockheedmartin.com/news-releases/news-release-details/us-navy-awards-lockheed-martin-383-million-next-generation-us/)