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U.S. Air Force firefighters assigned to the 379th Expeditionary Civil Engineering Squadron wear self-contained breathing apparatus as they participate in an evening memorial walk at Al Udeid Air Base, Qatar, Sept. 11, 2017. Traditionally, on the anniversary of the terrorist attacks, firefighters climb 343 stairs, the number of stairs that were in the twin towers, as a memorial to the fire and emergency services members that lost their lives on Sept. 11, 2001. Firefighters and security forces here at Al Udeid Air Base walked 3.43 miles to honor those who lost their lives on Sept. 11, 2001. (U.S. Air National Guard photo by Tech. Sgt. Bradly A. Schneider/Released)
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