U.S. Army Military Working Dog Chek, 3rd Military Police Detachment patrol explosives detector dog, performs obedience training with his handler at Fort Eustis, Va., Feb. 4, 2014. Chek is the 4-year-old partner of Spc. Roxanne Cavezuela, 3rd MP Det. military working dog handler. (U.S. Air Force photo by Staff Sgt. Katie Gar Ward/Released)