As U.S. Modernizes Nuclear Weapons, ‘Smaller’ Leaves Some Uneasy

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As U.S. Modernizes Nuclear Weapons, ‘Smaller’ Leaves Some Uneasy
As North Korea dug tunnels at its nuclear test site last fall, watched by American spy satellites, the Obama administration was preparing a test of its own in the Nevada desert. A fighter jet took off with a mock version of the nation’s first precision-guided atom bomb.