U.S. Air Force 90th Civil Engineer Squadron Airmen operate wheeled excavator equipment as 119th Civil Engineer Squadron training cadre work with the visiting students at the North Dakota Air National Guard Regional Training Site, Fargo, N.D., Sept. 29, 2021. The Fargo civil engineer training site is one of four in the Air National Guard. The students are using heavy equipment and materials to patch simulated bomb impact craters to a concrete training runway using a new Rapid Airfield Damage Recovery (RADR) system for the first time at the Fargo site. (U.S. Air National Guard photo by Chief Master Sgt. David H. Lipp)