The last US combat convoy left Iraq on Thursday, rather some time after George W. Bush declared an end to combat operations in Iraq in May, 2003.
Of course, this flat statement is not entirely accurate. The remaining 50,000 troops are viewed as trainers and logistics support to the Iraqi government. But they include special operations units, helicopter gunship crews, and other war fighters who are still going to be engaged in combat but will not be categorized as being in Iraq for that purpose. Iraq has no air force to speak of, and the US will be providing the air support until at least 2018.