Overview
- The National Nuclear Security Administration said Y‑12 completed 'diamond stamping' of all planned B61‑13 canned subassemblies three months ahead of schedule, marking those parts as war‑reserve quality.
- Diamond stamping is NNSA’s final quality check that a canned subassembly — the sealed casing that holds a weapon’s secondary stage — has passed all inspections and can enter the active stockpile.
- NNSA assembled the program’s first B61‑13 production unit in May 2025, and officials say the new variant will be produced only in modest numbers to replace older B61 bombs rather than expand overall inventory.
- The B61‑13 reuses B61‑12 production infrastructure and compressed review steps to speed delivery, and it is being certified only for use by U.S. strategic bombers, with the B‑21 Raider identified as the primary delivery platform.
- The milestone tightens the U.S. bomber force’s options against hardened or buried targets and is likely to shape targeting, deterrence planning, and arms‑control discussions as the limited rollout continues.