In September 1962, when Martin Dockery landed in Saigon, he was a young, determined, idealistic U.S. Army first lieutenant convinced of America's imminent victory in Vietnam. While most of the twelve thousand U.S. military advisors in-country at the time filled support positions in Saigon and other major cities, Dockery was one of a handful of advisors assigned to Army of the Republic of Vietnam (ARVN) combat units.

For eight months Dockery lived and fought in the heart of the Mekong Delta with an ARVN infantry battalion on missions and operations that often lasted several days. And for...