U.S. Army Sgt. Duong Tran moves to a roof top to provide security for other soldiers as they search the roof of a suspect house for hidden weapons caches during a search and cordon patrol in the city of Al Mahmudiyah, Al Mahmudiyah district, Baghdad province, Iraq, on Sept. 4, 2008. Tran is assigned to the 3rd Battalion, 320th Field Artillery Regiment, 3rd Brigade Combat Team, 101st Airborne Division (Air Assault).