Air Force 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)