U.S. Army soldiers of the 1st Battalion 320th Alpha Battery, 2nd Brigade of the 101st Airborne Division, lay razor wire outside the walls of Combat Outpost Nolen, in the volatile Arghandab Valley, in Kandahar, Afghanistan, Thursday, July 22, 2010. (AP Photo/Rodrigo Abd)

Photo by: Rodrigo Abd

U.S. Army soldiers of the 1st Battalion 320th Alpha Battery, 2nd Brigade of the 101st Airborne Division, lay razor wire outside the walls of Combat Outpost Nolen, in the volatile Arghandab Valley, in Kandahar, Afghanistan, Thursday, July 22, 2010. (AP Photo/Rodrigo Abd)