US Marines stand around a casket during the transfer of remains ceremony marking the return to the US of the remains of the four Americans killed in an attack this week in Benghazi, Libya, at the 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