Bill Haponski was a 1956 graduate of West Point, commissioned in the armor branch. He served in a tank battalion in Europe during the Cold War. In 1967 he received a doctorate in English language and literature from Cornell University while also teaching full-time at West Point.
Arriving in Vietnam in 1968 as a lieutenant colonel, he first was the senior staff officer in 11th Armored Cavalry Regiment, then served as commander of the Task Force 1st Squadron, 4th Cavalry, 1st Infantry Division. The task force was engaged in everything from pacification to contacts with small enemy units to fierce day-and-night battles against battalions and a regiment. Down in the jungle, night and day, he directed the battles in close combat along with his men.
After Vietnam he returned to West Point and became Professor of Military Studies, first at University of Vermont, then at Fordham University. After retiring from the Army, he held further academic positions and wrote several books.