They were little more than boys in the turbulent 1960s when Lee Roy Herron and his high school buddy, David Nelson, signed up for Marine Corps officer training. Decisions during college took the pair in different directions--Lee Roy to the infantry, language school, and the cauldron of Vietnam, David to law school, the JAG office, and eventually to Okinawa. When Lt. Lee Roy Herron was killed on the front lines in February 1969, only two months into...