I recently took my two teenage sons to a talk by Frank Kravetz, a 90-year-old World War II veteran who survived Hitler’s Nuremberg prisons. Frank published his story in a memoir, Eleven Two: One WWII Airman’s Story of Capture, Survival and Freedom. Frank’s ordeal began in November 1944 during a bomb-run over Germany. He took his regular position, crammed into the tail of a B-17. The target was Merseberg, a major industrial area. He flew amid an air armada of 500 heavy bombers—each carrying eighteen 250-pound bombs—escorted by 900 fighter planes. While the Americans were ready for business, so was...