Airmen assigned to the 8th Civil Engineer Squadron fill a crater with water and concrete during a Rapid Airfield Damage Repair training at Kunsan Air Base, Republic of Korea, July 28, 2021. The crater fill was one of many stages involved in Rapid Airfield Damage Repair (RADR); a process that allows Airmen to quickly fix a heavily damaged airfield. (U.S. Air Force photo by Staff Sgt. Gabrielle Spalding)