U.S. President Barack Obama and Secretary of State Hillary Clinton participate in a transfer ceremony of the remains of U.S. Ambassador to Libya, Chris Stevens and three other Americans killed this week in Benghazi, at Andrews Air Force Base near Washington, September 14, 2012. Ambassador 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)