U.S. servicemen line up to board a bus as they begin their journey home at Al Asad Air Base west of Baghdad, Iraq, on Nov. 1. The U.S. has promised to withdraw from Iraq by the end of the year as required by a 2008 security agreement between Washington and Baghdad. Some 39,000 U.S. troops are scheduled to clear out along with their equipment. Khalid Mohammed/AP hide caption

itoggle caption Khalid Mohammed/AP