Whole units are missing from the battlefield and that has to concern CENTCOM planners. Whole divisions are gone. The arrogant and clueless Richard Perle says they've gone home. He's an idiot. They've done no such thing. If they did, you'd see signs. Abandoned equipment, lots of surrenders, the surrender of cities or even the beginnings of civil war as the regulars shot it out with the Baathists.
Instead, they're nowhere to be found.