Gone but still present

Regardless of whether U.S. troops are here or not, there will be a massive American diplomatic presence.

The U.S. Embassy in Baghdad is the largest in the world, and the State Department will have offices in Basra, Irbil and Kirkuk as well as other locations around the country where contractors will train Iraqi forces on U.S. military equipment they're purchasing.

About 5,000 security contractors and personnel will be tasked with helping protect American diplomats and facilities around the country, the State Department has said.

The U.S. Embassy will still have a handful of U.S. Marines for protection and 157 U.S. military personnel in charge of facilitating weapons sales to Iraq. Those are standard functions at most American embassies around the world and would be considered part of the regular embassy staff.

When the 2008 agreement requiring all U.S. forces leave Iraq was passed, many U.S. officials assumed it would inevitably be renegotiated so that American forces could stay longer.

The U.S. said repeatedly this year it would entertain an offer from the Iraqis to have a small force stay behind, and the Iraqis said they would like American military help. But as the year wore on and the number of American troops that Washington was suggesting could stay behind dropped, it became increasingly clear that a U.S. troop presence was not a sure thing.

The issue of legal protection for the Americans was the deal-breaker.

Iraqis are still angry over incidents such as the Abu Ghraib prison scandal or Haditha, when U.S. troops killed Iraqi civilians in Anbar province, and want American troops subject to Iraqi law.