One might think that the United States’ nuclear weapons—the cornerstone deterrent in the country’s arsenal—would be treated with the utmost precision. This comfortable illusion was shaken on Aug. 31, 2007, when crews loaded six live nuclear warheads onto a B-52 bomber and flew from Minot Air Force Base in North Dakota to Barksdale Air Force Base in Louisiana, cruising over the nation’s heartland. Each warhead was 10 times more powerful than the atomic bombs dropped on Hiroshima and Nagasaki during World War II.
