Staff Sgt. William Rider and his partner, Rex, inspect vehicles at the search pit at Kirkuk Air Base, Iraq, Aug. 26. All vehicles entering base are inspected to ensure no explosives or weapons are able to get on base. Sergeant Rider and Rex are part of the 506th Expeditionary Security Forces Squadron military working dog section. (U.S. Air Force photo/Staff Sgt. Stacy Fowler)