For nearly 50 years, Strategic Air Command maintained an unsparing, no-nonsense operational culture. After the Air Force disestablished the legendary SAC at the end of the Cold War, however, USAF’s nuclear element slowly drifted away from that exacting standard. It was a mistake, as everyone now will readily, almost compulsively, concede. That certainly goes for Lt. Gen. Frank G. Klotz, the officer chosen to head USAF’s new Global Strike Command. “If there is one unchanging, immutable truth” about the nuclear arsenal, said Klotz, “it is that it demands constant and undivided attention.” That didn’t carry on in the post-SAC years,...