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Participants of the 9/11 Tower Challenge walk up and down the steps at Gila River Arena Sept. 11, 2021, Glendale, Arizona. Over 1,500 participants attended the event including civilians, active-duty and reserve military personnel, veterans, firefighters and first responders. Participants walked up and down stadium stairs representing the 110 flights of stairs climbed by New York City firefighters during the attacks on the World Trade Center and in honor of those who lost their lives. (U.S. Air Force photo by Senior Airman David Busby)
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