U.S. Soldiers, along with East Africa Response Force soldiers, prepare to embark aboard a U.S. Air Force C-130 Hercules aircraft at Camp Lemonnier, Djibouti, en route to Juba, Sudan, Dec. 18, 2013. The U.S. State Department requested the assistance of U.S. military forces in evacuating personnel from the embassy in Juba to Nairobi, Kenya, amid political and ethnic violence in South Sudan.