U.S. Air Force Tech. Sgt. Christopher Perry, the 916 Civil Engineer Flight (CEF) assistant chief of operations and Lt. Col. Joseph Winchester, 916th Mission Support Group (MSG) commander make entry to a simulated smoke-filled structure on Seymour Johnson Air Force Base, North Carolina, Jan. 9, 2020. The 916 CEF is a unit within the 916 MSG. (U.S. Air Force photo by Staff Sgt. Mary McKnight)