In this Thursday, June 19, 2008 file photo, a U.S. Marine takes cover behind an Iraqi Army humvee during the beginning of combat operations in Amarah, Iraq, 200 miles southeast of Baghdad. The United States will withdraw most of its troops from Iraq by August 2010, 19 months after President Barack Obama's inauguration day, according to administration officials who expect Obama to make the announcement on Friday. Hadi Mizban