U.S. Air Force members of the 90th Civil Engineer Squadron use an asphalt recycler to prepare asphalt material for use in simulated bomb impact crater patching on a civil engineer training runway at the North Dakota Air National Guard Regional Training Site, Fargo, N.D., Sept. 29, 2021. The engineers are using the Rapid Airfield Damage Recovery (RADR) system for training to repair damage to a 150 feet by 750 feet concrete simulated runway, sectioned off in 20 foot by 20 foot squares for training craters. It is specially designed for making holes in the concrete squares that simulate bomb impact craters that can be repaired with fill and capping material. (U.S. Air National Guard photo by Chief Master Sgt. David H. Lipp)
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