U.S. Army Pfc. Michael Martinez, a military working dog handler assigned to the 3rd Military Police Detachment, prepares to provide search capabilities with MWD Chek, a patrol explosives detector dog also assigned to the 3rd MP Det., during an active shooter exercise at Fort Eustis, Va., June 26, 2014. The exercise was the first Martinez has participated in since arriving at Fort Eustis in April. He said it gave him keen insights on emergency preparation and response procedures. (U.S. Air Force photo by Staff Sgt. Katie Gar Ward/Released)