A Kuwaiti border guard watches a convoy from the U.S. Army's 3rd Brigade, 1st Cavalry Division crossing the border from Iraq into Kuwait, Sunday, Dec. 18, 2011. The brigade's special troops battalion are the last American soldiers to leave Iraq. The U.S. military says the last American troops have left Iraq as the nearly nine-year war ends. (AP Photo/Maya Alleruzzo)

Photo by: Maya Alleruzzo

A Kuwaiti border guard watches a convoy from the U.S. Army's 3rd Brigade, 1st Cavalry Division crossing the border from Iraq into Kuwait, Sunday, Dec. 18, 2011. The brigade's special troops battalion are the last American soldiers to leave Iraq. The U.S. military says the last American troops have left Iraq as the nearly nine-year war ends. (AP Photo/Maya Alleruzzo)