U.S. Army Spc. Roxanne Cavezuela, 3rd Military Police Detachment military working dog handler, prepares to conduct obedience training with her dog, MWD Chek, a patrol explosives detector dog, during a demonstration for Canadian Air Cadets from the 180th Mosquito Squadron at Fort Eustis, Va., March 12, 2014. The obedience training allows the working dogs to execute commands in exchange for a reward or toy. (U.S. Air Force photo by Staff Sgt. Katie Gar Ward/Released)