U.S. Marine Scout-Snipers Sgt. Travis Beattie, left, and Cpl. Eric Stainbrook, of Sniper Platoon, 3/4 Marines, look for Taliban fighters in the tree line around Patrol Base 302, in Helmand province, southern Afghanistan, Wednesday, Aug. 24, 2011. The Marines living in austere conditions at PB302 exchange fire regularly with Taliban who attack from nearby positions. (AP Photo/Brennan Linsley)

U.S. Marine Scout-Sniper Sgt. Travis Beattie, of Sniper Platoon, 3/4 Marines, readies to fire his long-range rifle while looking for Taliban fighters in the treeline around Patrol Base 302, in Helmand province, southern Afghanistan, Wednesday, Aug. 24, 2011. The Marines living in austere conditions at PB302 exchange fire regularly with Taliban who attack from nearby positions. (AP Photo/Brennan Linsley)

U.S. Marine Scout-Snipers Lance Cpl. Andrew Norberg, left, and Cpl. Eric Stainbrook, of Sniper Platoon, 3/4 Marines, look for Taliban fighters in the treeline around Patrol Base 302, in Helmand province, southern Afghanistan, Wednesday, Aug. 24, 2011. The Marines living in austere conditions at PB302 exchange fire regularly with Taliban who attack from nearby positions. (AP Photo/Brennan Linsley)

U.S. Army soldiers from the Alpha Company 2nd battalion 27th infantry regiment, Task Forces Bronco, prepare their weapons for their overnight mission in FOB Bostick in Naray district, Kunar province, eastern Afghanistan August 24, 2011. (REUTERS/Nikola Solic)

Flares are seen under a medevac helicopter from the 159th Brigade Task Force Thunder as it flies back after a mission to FOB Pasab on August 24, 2011, some kilometers west of Kandahar. (AFP PHOTO/Johannes)

Semena, a ten-year old wounded Afghan girl is carried by US army medic Stephan Flynn to a Medevac helicopter of 159th Brigade Task Force Thunder to be airlifted to Kandahar hospital on August 21, 2011. The girl was wounded by shrapnel on both arms. (AFP PHOTO/Johannes)

U.S. Army Black Chinook helicopters take off from the landing zone of the FOB Bostick in Naray district at Kunar province, eastern Afghanistan, August 23, 2011. (REUTERS/Nikola Solic)