US finishes first nuclear warhead production for new cruise missile

The National Nuclear Security Administration (NNSA) has completed the first production unit of a critical nuclear warhead component, the “canned subassembly” (CSA), for the W80-4 Life Extension Program 18 months ahead of schedule. The CSA, produced at the Y-12 National Security Complex in Tennessee, forms the secondary stage of the thermonuclear W80-4 warhead, which will arm the Air Force’s new Long-Range Standoff cruise missile, replacing the older Air Launched Cruise Missile. This milestone, celebrated on September 22, reflects a rare early achievement in the US nuclear modernization effort, which aims to update aging Cold War-era weapons amid growing global threats. The full W80-4 warhead is expected by 2027, ahead of the Air Force’s planned timeline. The success is attributed to close collaboration between Lawrence Livermore National Laboratory (LLNL), which designed the warhead, and Y-12’s production teams. LLNL scientists and