Leo Litwak was a university student when he joined the Army to fight in World War II, "a na've, callow eighteen-year-old son prepared to join other soldier boys being hauled off to war." In 1944 he found himself in Belgium, in the middle of the waning European war, a medic trained to save lives but often powerless to do much more than watch life slip away. It was hard fighting that took Litwak and his rifle company into the heart of Germany at the...