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A volunteer prepares names of fallen first responders for participants of the 9/11 Memorial Climb at MacDill Air Force Base, Florida, Sept. 11, 2025. MacDill service members, alongside Hillsborough County firefighters, climbed nine flights of stairs 411 times to honor the 411 first responders who lost their lives during the Sept. 11, 2001, terrorist attacks on the World Trade Center. (U.S. Air Force photo by Airman 1st Class Monique Stober)