The 15th annual Air Force Marathon and 10K events are under way as the first of 13,000 runners cross the starting line to begin their individual events. This year's event included runners from all 50 states and 15 countries. 45 runners had previously run the other 14 annual marathon events. The marathon was held on and around Wright-Patterson AFB, Ohio, Sept. 17. (U.S. Air Force Photo/Tech. Sgt. Joe Davidson)