US President Barack Obama (R) looks as the remains of four Americans, including US ambassador to Libya Chris Stevens, are loaded during the transfer of remains ceremony at Andrews Air Force Base in Maryland on September 14, 2012. US Ambassador Christopher Stevens died on Tuesday along with three other Americans in the assault on the consular building in Benghazi, on the 11th anniversary of the September 11 attacks. AFP PHOTO/Jewel SAMAD/AFP/GettyImages