Kristensen, Hans M., and Robert S. Norris

Abstract
The US nuclear arsenal remained roughly unchanged in the last year, with the Defense Department maintaining an estimated stockpile of some 4,670 warheads to be delivered via ballistic missiles and aircraft. Most of these warheads are not deployed but stored, and many are destined to be retired. Of the approximately 1,930 warheads that are deployed, roughly 1,750 are on ballistic missiles or at bomber bases in the United States, with another 180 tactical bombs deployed at European bases.
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