Airman 1st Class Michael Blumer, 51st Civil Engineer Squadron heating, ventilation and air conditioning apprentice, center, pulls a vibrating screed during rapid airfield damage repair training at Osan Air Base, South Korea, April 19, 2019. RADR is a quick process used to repair damages on an airfield where civil engineers evaluate damages, prepare areas for repair and pour concrete to return the airfield an operational status. (U.S. Air Force photo by Staff Sgt. Ramon A. Adelan)

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Photo by: Staff Sgt. Ramon Adelan |  VIRIN: 190419-F-HK496-9190.JPG