U.S. Air Force Staff Sgt. Sean Davis, 7th Security Forces Squadron military working dog handler, watches his dog, Robi, searches to locate any prohibited items on a vehicle Aug. 11, 2015, at Dyess Air Force Base, Texas. Military working dogs are also used on patrols to act as a deterrent for the base. (U.S. Air Force photo by Airman 1st Class Austin Mayfield/Released)