Maybe they are lost. Gee, I hope they don't lose their way so badly that they wind up in Damascus.
Yesterday, a reporter from Jane's Defence Weekly reported that a brigade of the 4th had already gone into Iraq. My guess is a Saturday morning surprise at Tikrit.
By the way, I believe that some elements of the Big Red One (from Germany), with armor, are already in northern Iraq. I saw a patch on one of the guys in a news report today.