Senior Master Sgt. Rhonda McMichael rings a bell at 7:46 a.m. Central Standard Time Sept. 11, 2011, in honor of the men, women and children who perished when American Airlines Flight 11 crashed into the North Tower of the World Trade Center in New York City Sept. 11, 2001. The Continental U.S. North American Aerospace Defense Command Region-1st Air Force (Air Forces Northern) held a ceremony to honor the memory of those who died during the worst terrorist attack on American soil. (U.S. Air Force photo by Angela Pope)