U.S. Army Maj. William Coryell, operations officer, 2nd - Black Jack - Brigade Combat Team, 1st Cavalry Division, Fort Hood, Texas, performs situps during the U.S. National Guard 5k race and Minuteman Challenge on Bagram Air Field, Dec. 14, 2013. Coryell was on Team Black Jack Command Group. 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)