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Introduced in 1979, the W78 nuclear warhead is the oldest weapon in the U.S. nuclear stockpile that has not undergone a major update or replacement. Replacing this warhead could end up being the most expensive warhead replacement effort since the end of the Cold War, and could have broader implications on the Air Force and on warhead programs. We talk to Allison Bawden--an expert on U.S. nuclear weapons management and a director in our Natural Resources and Environment team--about her review of Department of Defense’s and the National Nuclear Security Administration's efforts.