An Afghan soldier launches a rocket-propelled grenade as U.S. soldiers of the 1-320th Alpha Battery, 2nd Brigade, of the 101st Airborne Division duck during a clash with insurgents at in the volatile Arghandab Valley in Kandahar, Afghanistan, on Tuesday, July 27, 2010. (AP Photo/Rodrigo Abd)

Photo by: Rodrigo Abd

An Afghan soldier launches a rocket-propelled grenade as U.S. soldiers of the 1-320th Alpha Battery, 2nd Brigade, of the 101st Airborne Division duck during a clash with insurgents at in the volatile Arghandab Valley in Kandahar, Afghanistan, on Tuesday, July 27, 2010. (AP Photo/Rodrigo Abd)