U.S. Air Force Staff Sgt. Matthew Hordeski, a member of the 601st Air and Space Operations Center Color Guard, rings a bell prior to a moment of silence during a memorial service Sept. 11, 2014, in front of the 601st AOC at Tyndall Air Force Base, Fla. The 601st AOC held a ceremony to honor the memory of those who lost their lives during the tragic events of Sept. 11, 2001. (Air National Guard photo by Capt. Jared Scott/Released)