U.S. Army Staff Sgt. Robert Dominguez stands guard next to a burning oil well in the oil fields of Rumaila, Iraq, on March 27, 2003. The U.S. troop presence in the country has spanned three presidential administrations.
(MARIO TAMA/Getty Images)
The number of U.S. forces in Iraq today stands at a fraction of the troop strength during the war that started with the coalition invasion in 2003. Nevertheless, their presence remains unpopular among Iraq's Shiite lawmakers and militias aligned with Iran.