
The National Nuclear Security Administration (NNSA) said Monday it has officially OK'd the production engineering phase of the B61-12 warhead life-extension program, marking the program’s entry into the final phase of development before production.This milestone follows four years of work in the development-engineering phase, NNSA said, noting that the first production unit is expected in fiscal 2020. Production is projected to finish by 2024.The NNSA and the Air Force began the life-extension program in 2010 to consolidate four versions of…