The 1st Air Cavalry Division was the most lethal assault force assembled in Vietnam. The pilots were the first to fully harness the power of helicopters and their soldier's combat record was second to none. Steven E Warren served a year in the infantry in Vietnam, but then returned home to train to fly helicopters. Soon he returned to the conflict, as a Huey helicopter pilot in the 1st Air Cavalry. We spoke with him about his combat experiences, helping to perfect this new kind of warfare.