Clint Castleberry was already an Atlanta-area football sensation when he arrived at Georgia Tech in 1942, and in one meteoric college season he became a national sports hero as well. He was the first college freshman ever to be voted All-American. At least one Heisman Trophy was all but certain. Though weighing just 155 pounds, he seemed destined to become one of the greatest tailbacks in college football history. But then World War II intervened,...