Petraeus Assumes Leadership of U.S. Central Command

New head of the U.S. Central Command, U.S. Army Gen. David Petraeus covers his heart as troops applaud during change of command ceremonies Friday morning Oct. 31, 2008 at MacDill Air Force Base in Tampa, Fla. Petraeus takes over the command from U.S. Army Lt. Gen. Martin Dempsey. (AP Photo/Chris O'Meara)