A US soldier takes a defensive position during an operation in the Arghandab River Valley in Kandahar

 
A US soldier takes a defensive position during an operation in the Arghandab River Valley in Kandahar
A soldier from the U.S. Army's 2nd Platoon, Alpha Troop, 2-1 Infantry Battalion, 5/2 Striker Brigade Combat Team takes a defensive position during an operation in the Arghandab River Valley in Kandahar Province April 15, 2010. REUTERS/Tim Wimborne (AFGHANISTAN - Tags: MILITARY)