Airmen from the 757th Maintenance Squadron run with

Airmen from the 757th Maintenance Squadron run with the American flag during the 9/11 Old Glory Challenge Sept. 11, 2013, at Nellis Air Force Base, Nev. The 9/11 Old Glory Challenge is an event held in tribute to those who lost their lives during the terrorist attack Sept. 11. Units from Nellis AFB ran in 30 minute increments around Freedom Park with the flag from 6 a.m. to 4:30 p.m. (U.S. Air Force photo by Staff Sgt. Michael Charles)