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Members of the Davis-Monthan and Tucson Police Department Honor Guard post the colors during the 9/11 Tower Challenge at the University of Arizona football stadium in Tucson, Ariz., Sept. 11, 2015. Members of 12th Air Force (Air Forces Southern) joined the Tucson community to honor those who lost their lives during the Sept. 11, 2001 attacks and to show their support for first responders and military members who continue to protect the U.S. from foreign and domestic threats. During the 9/11 Tower Challenge, participants climbed 2,071 steps representing the number of steps that were in the Twin Towers. (U.S. Air Force Photo by Tech. Sgt. Heather R. Redman/Released)
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