Air Force Gen. Gene Renuart, North American Aerospace Defense Command and U.S. Northern Command commander, offers remarks at the May 18 commemoration ceremony for the commands' new 9/11 memorial in front of the commands' headquarters building at Peterson Air Force Base, Colo. The memorial consists of a steel beam recovered from the World Trade Center, soil from Pennsylvania and a pentagon shaped planter to honor those who died in New York City, Shanksville, Pa., and the Pentagon. (U.S, Air Force photo/Staff Sgt. Thomas J. Doscher)