SOUTHWEST ASIA --   Military service members cheer as they approach the half-way point of the 40th Annual U.S. Marine Corps Marathon-Forward at an undisclosed location in Southwest Asia, Oct. 25, 2015. The official marathon which was held in Virginia and Washington D.C., began in October 1975 and aims to promote physical fitness as well as foster goodwill in the community and showcase the organizational skills of the U.S. Marine Corps. (U.S. Air Force photo by Staff Sgt. Jerilyn Quintanilla/Released)