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The National Nuclear Security Administration (NNSA) late last year finished refurbishing the final submarine-launched W76 ballistic missile warheads for another 30 years of service, the agency confirmed. The NNSA finished building the last W76-1 warhead in December, an agency spokesperson said Tuesday by email. The semiautonomous Department of Energy agency started planning for the W76-1 life-extension program in 1999 and delivered the first war-ready warhead to the Navy in 2008. The whole project cost about $4 billion, according to the NNSA’s…
