Phil Gioia grew up an army brat during the decades after World War II. Drawn to the military, he attended the Virginia Military Institute, then was commissioned in the U.S. Army, where he completed Jump School and Ranger School. Not even a year after college graduation, he landed in Vietnam in early 1968--in the first weeks of the Tet offensive, which marked a major escalation of the war. Leading a platoon in the 82nd Airborne Division, Gioia took...