In theory, anyway.
In fact, thousands of mercenaries -- er, "security contractors" -- remain in Iraq, working with or for 10-20,000 allegedly civilian US government employees.
Oh, and drones. Supposedly just in Kurdish northern Iraq, but don't be surprised when Pakistan-like "13 killed in alleged US strike" stories start coming out of the country next year.
Old wars don't die any more. They just fade off the front page.