(MARIO TAMA/Getty Images)
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.
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.
