An Afghan uniformed policeman watches U.S. Army Sgt. Mark R. Sheafer, an all-wheeled vehicle mechanic from Newtown Square, Pa., assigned to Troop C, 3rd Squadron, 4th Cavalry Regiment, Task Force Raider, 3rd Brigade Combat Team, 25th Infantry Division, Task Force Bronco, as he gets ready to change the oil in an AUP Humvee at Forward Operating Base Shinwar in eastern Afghanistan's Nangarhar province, July 17. The AUP use the training provided to fix their vehicles and train other members of their unit.