Reserve Officer Training Corps members from the University of Arizona joined over 1,000 active and retired first responders, military members, and their family members for the 9/11 Tower Challenge at the University of Arizona Football Stadium in Tucson, Ariz., Sept. 9, 2016. The 9/11 Tower Challenge is held every year in honor of all those who lost their lives on 9/11 and the first responders and military members who continue to serve today. ( Air Force photo by Tech. Sgt. Heather Redman)

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