Civil Engineers Repair Runway
Members of the 51st Civil Engineer Squadron respond to a simulated flightline crater during Exercise Beverly Herd 17-3 at Osan Air Base, Republic of Korea, September 20, 2017. During an attack the civil engineers would fill in the crater and compact it, once it is compact enough a structure is built to go over it. (U.S. Air Force photo by Airman 1st Class Gwendalyn Smith)

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Photo by: Airman 1st Class Gwendalyn Smith |  VIRIN: 170920-F-JW012-160.JPG