U.S. Air Force Chaplain (Lt. Col.) John Tillery, 17th Training Wing, speaks during his retirement ceremony at Taylor Chapel on Goodfellow Air Force Base, Texas, June 6, 2016. Tillery retired after 24 years of service as one of the last Vietnam War Era active-duty service members. (U.S. Air Force photo by Airman 1st Class Caelynn Ferguson/Released)