The US Defense Department said on Tuesday the Navy had fielded a low-yield submarine-launched ballistic missile warhead, something the Pentagon believes is needed to deter adversaries like Russia but which critics say lowers the threshold for using. Low-yield nuclear weapons, while still devastating, have a strength of less than 20 kilotons.
A 2018 Pentagon document called for the military to expand its low-yield nuclear capability, saying the United States would modify a small number of submarine-launched ballistic missile warheads with low-yield options.
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