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U.S. Air Force Tech. Sgt. David Kehl, 8th Civil Engineer Squadron fire officer, leads the 9/11 Remembrance stair climb at Kunsan Air Base, Republic of Korea, Sept. 11, 2024. Participants wore lanyards with the names and photos of first responders who died on 9/11 as they climbed a total of 2,200 steps of the dorm to signify the 110 stories of the World Trade Center.. (U.S. Air Force photo by Staff Sgt. Nicholas Ross)