The Legionnaire by Barry Sadler (Casca Series, Book 11) from Books In Motion.com

Cursed by Christ on Golgotha, Casca Longinus is condemned to live out the ages and wander the globe a constant soldier. Forever fighting, surviving, waiting for Him to return. Dien Bien Phu was to be France's most glorious victory in the Indo-China War. Eleven thousand courageous Legionnaires were flown into the valley, totally unaware that fifty thousand Viet Minh with heavy cannon were waiting in the hills above them. Though Intelligence Officer Nguyen Tich knew he would lead his Communist forces to victory, only the death of Carl Langers (Casca) could put his own soul to rest...permanently!