B61-13s will have less than one third the power of the biggest U.S. nuclear weapon - the B83 - which has a yield of 1.2 megatons, 80 times the Hiroshima bomb.
Barack Obama tried to retire the B83 but Donald Trump ended that effort.
At Los Alamos National Laboratory in New Mexico 3,300 workers have been hired in the last two years, with the workforce now numbering more than 17,000.
Workers are producing plutonium cores which are key components for nuclear weapons.
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