U.S. Army Sgt. 1st Class Delroy Barnett, a Soldier assigned to the 32nd Medical Brigade at Fort Sam Houstin, Texas, navigates through the obstacle course during the annual Platoon Sergeant of the Year competition at Fort Eustis, Va., Sept. 25, 2012. The competition, hosted by the U.S. Army Training and Doctrine Command, tested competitors' abilities both physically and mentally. (U.S. Air Force photo by Staff Sgt. Wesley Farnsworth/Released)