I just had an English translation of the U.S.-Iraq basing deal -- officially the Agreement Regarding the Temporary Presence in Iraq and its Activities and
“„The U.S. forces shall withdraw from Iraqi territories no later than December 31 2011.
“„U.S. forces may withdraw from Iraq before the dates indicated in this article if either of the two sides should so request. The U.S. government recognizes the Iraqi government’s sovereign right to request a withdrawal of U.S. forces at anytime.