Video: US President Barack Obama vows to 'stand fast' against protests as bodies of Americans return from Libya Leading a somber ceremony with the flag-draped caskets of the dead laid out beside him, US President Barack Obama pledged to do everything possible to protect US diplomats abroad and said he would hold foreign governments responsible for helping to safeguard them. "The United States will never retreat from the world," Mr Obama told guests that included grieving family members, diplomatic personnel and military service members inside a vast aircraft hangar at Andrews Air Force Base outside Washington. We will bring to justice those who took them from us. We will stand fast against the violence on our diplomatic missions," he said. The obscure California-made film triggered an attack on the US consulate in the Libyan city of Benghazi that killed US Ambassador Christopher Stevens, State Department information management officer Sean Smith and security personnel Tyrone Woods and Glen Doherty, both former Navy SEALS. The remains were to be flown to a military mortuary at an air base in Dover, Delaware.