If they head straight for Fallujah or Tikrit or the Syrian border and start disciplining the Hadjis, that'll be a clue, too.
They went to Samarra, which is fairly wooly, and have disciplined a few Hadjis. Wonder how 2-3 Inf got picked for convoy escort? Wonder how long they will be on it. 5-20 gets all the publicity. Hadn't seen anything on 2-3 until today.