Moving away from Iraq would "a very momentous decision," O'Hanlon said.
But Wilkerson, rated as "slim to none" Mullen's chances of making major changes in the use of US forces in what is left of the Bush administration.
"He can react to outside events and give advice," Wilkerson said. "But the idea that he would come in as the adviser to the secretary and the president be able to make sweeping changes from where we're headed right now is probably a dream."
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