** FILE ** Vice President Joseph R. Biden (second from left) meets in Baghdad on Monday, Aug. 30, 2010, with (from left) Gen. Raymond T. Odierno, the outgoing U.S. commander in Iraq; U.S. Ambassador to Iraq James Jeffrey; Marine Gen. James Mattis, head of U.S. Central Command; and Lt. Gen. Lloyd Austin, the incoming commander of U.S. forces in Iraq. The change of command ceremony was held Wednesday. (AP Photo/Hadi Mizban)
U.S. Vice President Joe Biden, left, his wife, Jill Biden, center and Gen. Ray Odierno, the top U.S. commander in Iraq, right, are seen during a naturalization ceremony for service members at al-Faw Palace on the western outskirts of Baghdad, Iraq, Sunday, July 4, 2010. (AP Photo/Hadi Mizban)
U.S. Vice President Joe Biden, right, Gen. Ray Odierno, center, and U.S. Ambassador to Iraq Christopher Hill, left, confer at the embassy in Baghdad, Iraq, Saturday, July 3, 2010. (AP Photo/Hadi Mizban)
** FILE ** President Bush is greeted by the commander of U.S. forces in Iraq, Gen. Raymond T. Odierno (left), and U.S. Ambassador to Iraq Ryan Crocker (center) on Sunday, Dec. 14, 2008, in Baghdad, on Mr. Bush's surprise visit to Iraq.