Theory: These kids are being trained to fail in a real life situation, leaving the door open for battle hardened troops to come in to finish the job.
Why? To create further sympathy for poor IRS agents and turn public opinion against gun owners and right-wingers in general.
Not a bad theory. Let the kids initiate contact, ferret out the fighting Americans, then send in troops.
If this video is not a spoof, that would be the only purpose. Either they go in blasting away or they get the gun taken away and used on them.