U.S. service members perform tire flips during the U.S. National Guard 5k race and Minuteman Challenge on Bagram Air Field, Dec. 14, 2013. The race and challenge concluded a three-day National Guard 377th birthday celebration hosted by the Ohio National Guard 437th Military Police Battalion and National Guard Affairs -Afghanistan. (U.S. Army photo by Sgt. Quentin Johnson, 2nd BCT PAO, 1CD)