U.S. Air Force Lt. Gen. William Etter, Continental U.S. North American Aerospace Defense Command Region-1st Air Force (Air Forces Northern) commander, speaks to his command during a memorial service Sept. 11, 2013, in front of the 601st Air and Space Operations Center 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)