NM labs working to refurbish B61 versions
Since the 1960s, when the first B61 nuclear bomb was built, there have been 11 versions of the weapon, five of which are still active in the U.S. nuclear arsenal.
That includes the B61-11, a ground-penetrating weapon known as the “bunker buster,” which will remain in the stockpile after the current modernization program to extend the B61′s life is finished.
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All told, the system-wide overhaul is projected to cost more than $350 billion over the next 10 years, according to a 2012 study by the Stimson Center, a nonpartisan think tank in Washington, D.C.
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