U.S. troops stand guard at an outpost on the edge of Baghdad's Sadr City that they share with Iraqi police. New concrete walls and sand-filled barriers were recently installed at the base as added protection against mortars, rockets, and truck bombs.

soldier shouldering an AT-4 anti-tank weapon newly distributed to his western Baghdad outpost in order to allow guards to stop suicide bombers driving armored trucks - one of the latest threats to the outposts.