Soldiers from the 3rd Brigade, 1st Cavalry Division, wait to start an internal patrol at Camp Adder, now known as Imam Ali Base, near Nasiriyah, Iraq December 16, 2011. The last convoy of U.S. soldiers pulled out of Iraq on Sunday, ending their withdrawal after nearly nine years of war and military intervention that cost almost 4,500 American and tens of thousands of Iraqi lives. Picture taken December 16, 2011. REUTERS/Mario Tama/Pool (IRAQ – Tags: CIVIL UNREST CONFLICT POLITICS)