U.S. Air Force Staff Sgt. Mark Mitchell, 7th Security Forces Squadron military working dog handler, trains with his dog, Ivan, on obedience at Dyess Air Force Base, Texas, Aug. 9, 2018. Training for handlers and dogs begins at Lackland Air Force Base in San Antonio, Texas. Technical training school for handlers lasts three months and is comprised of multiple phases to test the handler, and the dog’s progression. (U.S. Air Force photo by Senior Airman Shannon Hall)