Spc. Trevor Stringer, 217th Military Police Detachment (Fort Lee), scaled a building with his partner before entering a school on post during an active-shooter exercise at Fort Eustis, Va., Aug. 19, 2011. Soldiers from six Training and Doctrine Command units from across the United States battled for bragging rights as this year’s “top cop.” (U.S. Air Force photo by Staff Sgt. Antoinette Gibson/RELEASED)