U.S. Air Force Staff Sgt. James Thiebault, 372nd Training Squadron, Det. 20 instructor, keeps pace during the Mustang Half Marathon at Dyess Air Force Base, Texas, April 14, 2018. Thiebault was one of 21 runners who competed. Half marathons are a total of 13.1 miles in length. (U.S. Air Force photo by Airman River Bruce)