A US Army soldier patrols near Baraki Barak base in Afghanistan's Logar Province on October 13, 2012

A US Army soldier attached to 2nd platoon, C troop, 1st Squadron (Airborne) 91st U.S Cavalry Regiment, 173rd Airborne Brigade Combat Team operating under the NATO sponsored International Security Assistance Force (ISAF) patrols near Baraki Barak base in Logar Province, on October 13, 2012. A NATO soldier was killed by an improvised bomb blast on Friday.