Tech. Sgt. Scott Heise, 11th Security Support Squadron military working dog handler, poses as a suspect while training a K-9 on controlled aggression techniques at Joint Base Andrews, Md., July 29, 2015. Military working dogs are trained to attack fleeing suspects, detect narcotics and explosives and conduct building searches. (U.S. Air Force photo by Staff Sgt. Chad C. Strohmeyer)(Released)