The ceremony effectively ends the war two weeks earlier than was necessary under the terms of the security agreement signed by the U.S. and Iraqi governments in 2008, which stipulated that the troops must be gone by Dec. 31.
But commanders decided there was no need to keep troops in Iraq through the Christmas holidays given that talks on maintaining a U.S. presence beyond the deadline had failed. The date of the final ceremony had been kept secret for weeks, so as not to give insurgents or militias an opportunity to stage attacks.
