U.S. Air Force Airmen assigned to the 20th Civil Engineer Squadron explosive ordnance disposal flight ruck march at McCrady Army National Guard Base training area near Columbia, S.C., Aug. 23, 2018. The Airmen participated in four mile ruck march to their primary objective of the day. The primary objective was to capture a simulated deserting American service member, disabling all improvised explosive devices on the route. (U.S. Air Force photo by Airman 1st Class Benjamin Ingold)