W81
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The W81 was a planned American warhead to be mounted on the SM-2 surface-to-air missile used by the United States Navy. The W81 was believed to be derived from the B61 nuclear bomb which forms the backbone of the current US nuclear gravity bomb arsenal and from which the W80 cruise missile warhead is derived. The weapon was being designed at Los Alamos National Laboratory (at the time called Los Alamos Scientific Laboratory).[1]