U.S. Army Staff Sergeant Calvin Stammer from Charlie Company 4th Platoon, 1st Brigade 3-21 Infantry takes aim with his weapon during a patrol in the village of Sarah, in the Panjwai district of Kandahar province, southern Afghanistan June 10, 2011. (REUTERS/Baz Ratner)

A pistol is seen holstered as a U.S. Army soldier from Charlie Company 4th Platoon, 1st Brigade 3-21 Infantry prepares to go on patrol in the Panjwai district of Kandahar province, southern Afghanistan June 10, 2011. (REUTERS/Baz Ratner)

United States Marines carry injured U.S. Marine Lance Cpl. V.H. Salgado to a waiting medevac helicopter from the U.S. Army’s Task Force Lift “Dust Off”, Charlie Company 1-214 Aviation Regiment after he got shot in the foot outside Sangin, in the Helmand Province of southern Afghanistan, Friday, June 10, 2011. (AP Photo/Anja Niedringhaus)

U.S. Army soldiers from Charlie company 4th Platoon, 1st Brigade 3-21 Infantry walk past an Afghan boy during a patrol in the village of Sarah, in the Panjwai district of Kandahar province, southern Afghanistan June 10, 2011. (REUTERS/Baz Ratner)

U.S. Army First Lieutenant Jonathan Austin from Charlie Company 4th Platoon,1st Brigade 3-21 Infantry checks inside a barn during a patrol in the village of Sarah, in the Panjwai district of Kandahar province, southern Afghanistan June 10, 2011. (REUTERS/Baz Ratner)

United States Marine evacuate a wounded comrade onto a medevac helicopter from the US Army’s Task Force Lift “Dust Off”, Charlie Company 1-214 Aviation Regiment, after he was wounded in an IED strike near Sangin, in the Helmand Province of southern Afghanistan, Saturday, June 4, 2011.(AP Photo/Anja Niedringhaus)