The polical leaders of the insurgents have left the area and they have left the Kool-Aide drinkers behind to die. So OK, we get them. This is the Tet-Offensive for the Iraq war. That is why we are blocking the Syrian frontier.
And, we also get whatever they may have stashed there.
In both directions, I hope. What a surprise to the sneakouts from Fallujah to find that they are are royally screwed on their way away from Fallujah.