The remains of the U.S. ambassador and three other Americans killed in an attack in Libya are taken off a transport aircraft during a return of remains ceremony at Andrews Air Force Base near Washington, September 14, 2012. Ambassador Christopher Stevens and the other Americans died after gunmen attacked the lightly fortified U.S. consulate and a safe house refuge in Benghazi on Tuesday night. REUTERS/Jason Reed (UNITED STATES - Tags: POLITICS)