Air Force Week in Philadelphia
Staff Sgt. David Weaver, from the 305th Comptroller Squadron, McGuire Air Force Base, Ill., sings the national anthem at the National Liberty Museum on Philadelphia, Penn., during the start of an event at the musem May 29, 2008, for Air Force Week in Philadelphia. (U.S. Air Force Photo/Tech. Sgt. Scott T. Sturkol)