U.S. soldier PFC Troy Hayden from Task Force “No Fear” Alpha Co 2-27 Infantry “The Wolfhounds” scans an area through the scope of a machinegun inside a bunker of Combat Outpost (COP) Pirtle King in Ghaziabad district in Kunar province, eastern Afghanistan September 27, 2011. (AFP PHOTO/Tauseef MUSTAFA)

US army soldiers from Bravo company 2nd Batallion 27th Infantry Regiment fire 120 mm mortar rounds towards insurgent positions at Outpost Monti in Kunar province, on September 25, 2011. A decade of fighting in Afghanistan has since snowballed into a huge effort involving around 130,000 foreign troops from dozens of countries, with the resilient Taliban using homemade bombs and guerrilla tactics in a bid to undermine the Afghan government and the NATO mission. (AFP PHOTO/Tauseef MUSTAFA)

Smoke rises in Kunar province mountain ridges after U.S. military’s Apache helicopters attacked the Taliban positions as seen in a bunker of U.S. soldiers from Task Force “No Fear” Alpha Co 2-27 Infantry “The Wolfhounds” in Combat Outpost Pirtle King, in eastern Afghanistan September 27, 2011. Two Talibans were killed while another was wounded and captured after a joint U.S.-Afghan military engaged them in firefight. (AFP PHOTO/Tauseef MUSTAFA)

An Afghan soldier looks out from a bunker overlooking the mountain ridges of the Pakistan-Afghanistan border while manning a post with U.S. soldiers from Task Force “No Fear” Alpha Co 2-27 Infantry “The Wolfhounds” at Combat Outpost (COP) Pirtle King in Ghaziabad district in Kunar province, eastern Afghanistan September 27, 2011. (AFP PHOTO/Tauseef MUSTAFA)

U.S. soldiers from Task Force “No Fear” Alpha Co 2-27 Infantry “The Wolfhounds” fire a 120mm mortar at the Taliban position from Combat Outpost (COP) Pirtle King in Ghaziabad district in Kunar province, eastern Afghanistan September 27, 2011. (REUTERS/Erik De Castro)

U.S. Army 2nd Lt. Raymond Vetter and Staff Sgt. James Wardle of B Company, Task Force 1-71, 172nd Infantry Brigade provide security during a dismounted patrol outside of Forward Operating Base Curry, Paktika province, Afghanistan, Sept. 20.

U.S. Army 2nd Lt. Raymond Vetter of B Company, Task Force 1-71, 172nd Infantry Brigade and Command Sgt. Maj. Isaia Vimoto provide security during a dismounted patrol outside of Forward Operating Base Curry, Paktika province, Afghanistan, Sept. 20.

U.S. Army soldiers of B Company, Task Force 1-71, 172nd Infantry Brigade provide security during a dismounted patrol outside of Forward Operating Base Curry, Paktika province, Afghanistan, Sept. 20.