The W80-4 Life Extension Program is the National Nuclear Security Administration modernization path for extending the W80-1 cruise-missile warhead into the U.S. Air Force Long Range Standoff Weapon. Official NNSA, Sandia, LLNL, GAO, and congressional-budget sources frame it as a stockpile life-extension program rather than a conflict-use weapon: the design moved into Phase 6.4 production engineering in March 2023, a first canned subassembly was certified at Y-12 in September 2025, and full-warhead first production remains scheduled for 2027.
Official NNSA, Sandia, and Air Force sources tie W80-4 modernization to the Long Range Standoff missile program and its warhead-missile interface work.
| Compatible item | Item type | Compatibility evidence |
|---|---|---|
 | Nuclear air-launched cruise missile | NNSA says the W80-4 first-production-unit schedule supports the U.S. Air Force Long Range Standoff cruise missile's operational-capability schedule, while Sandia describes joint flight tests with the Air Force and Raytheon to pair the warhead with the missile. Sources: W80-4 Life Extension Program Enters Phase 6.4, Sandia W80-4 production engineering |
The W80-4 page is structured as a support record for the LRSO warhead package. Public sources describe engineering, production, and certification milestones inside the U.S. nuclear security enterprise, but they do not document combat use for the W80-4 itself.
NNSA describes W80-4 as the life-extension path for the W80-1 warhead, which LLNL's Science & Technology Review ties to the Air-Launched Cruise Missile lineage.
Lawrence Livermore and Sandia are the W80-4 design and engineering labs; Sandia is also responsible for custom electronics, including neutron generators.
The public NNSA fact sheet assigns component and assembly roles across Kansas City, Los Alamos, Pantex, Savannah River, Y-12, Sandia, and LLNL.
LLNL reported W80-4 in Phase 6.4 production engineering, with component teams approaching final design and production-development milestones.
Sources: W80-4 Life Extension Program Fact Sheet; LLNL S&TR legacy warhead article; Sandia W80-4 production engineering; LLNL FY 2025 Strategic Deterrence.
Sandia reported that the Nuclear Weapons Council selected W80-4 as the warhead for the Long Range Standoff missile, the Air Force's successor to the Air Launched Cruise Missile.
Sources: Sandia W80-4 feasibility phase
The Nuclear Weapons Council approved Phase 6.2 for the W80-4 LEP, moving the effort from early concept work into feasibility-study activity.
Sources: Sandia W80-4 feasibility phase
NNSA's public fact sheet says the program completed its Weapon Design and Cost Report in December 2018 before Nuclear Weapons Council approval for Phase 6.3.
Sources: W80-4 Life Extension Program Fact Sheet
The Nuclear Weapons Council approved transition into Phase 6.3 development engineering for the W80-4 LEP.
Sources: W80-4 Life Extension Program Fact Sheet
GAO reported that NNSA had adopted a fiscal-year 2025 first-production-unit date at an estimated program cost of about $11.2 billion, while recommending schedule-risk discipline for major milestones.
Sources: GAO W80-4 schedule constraints
NNSA approved the W80-4 Life Extension Program to transition into Phase 6.4 production engineering after design-review and pre-production engineering gates.
Sources: W80-4 Life Extension Program Enters Phase 6.4
Sandia said the W80-4 team conducted joint flight tests with the Air Force and Raytheon Missiles & Defense to pair the warhead with the LRSO delivery system.
Sources: Sandia W80-4 production engineering
NNSA certified the first W80-4 warhead canned subassembly at the Y-12 National Security Complex, describing it as a key part of the warhead's nuclear explosive package.
Sources: NNSA certifies first W80-4 warhead canned subassembly
LLNL's FY 2025 annual report described the W80-4 LEP as still in Phase 6.4 production engineering, with product-realization teams approaching final design and production-development milestones.
Sources: LLNL FY 2025 Strategic Deterrence
DOE-NNSA testimony to the Senate Armed Services Committee said the W80-4 canned-subassembly FPU had been achieved 18 months ahead of schedule and that the full warhead remained on schedule for FPU in 2027.
Sources: DOE-NNSA FY 2026 SASC testimony
