Lets just remember that its likely the military will refuse to come after us. That is why the DHS is getting those weapons. They are not the military or anywhere near it. Putting on a black tactical uniform and a helmet does not a soldier make. Most of them would cut and run at the first sign of serious trouble. They are not going to be a bunch of sharpshooters either.
Serious mistake to underestimate the enemy. ASSUME that they are going to be really good and prepare for that.