U.S. Air Force 18th Civil Engineer Squadron and Japan Air Self-Defense Force Southwestern Civil Engineering Group service members prepare a site for concrete pouring during a rapid airfield damage repair exercise Aug. 30, 2019, at Naha Air Base, Japan. The week-long bilateral exercise, which occurs twice a year, involves a variety of engineering mission sets, to include aircraft barrier arresting systems, water purification, and airfield repair operations. By regularly training together U.S. and Japanese airmen can more effectively execute large-scale engineering responses to contingencies. (U.S. Air Force photo by Staff Sgt. Peter Reft)