imported post
It's pretty simple. If they abide by all the rules of the US, I don't know of a law they'd be violating.
For the most part, if they unlawfully tried to arrest you, (or maybe try to make you go to a stadium after disarming you) you could kill them. It's irrelivant if they have a sworn oath to abide by our laws, the supreme court, as well as other courts, have established that we have an absolute right to self defense, including to protect ourselves from rogue government agents. The funny thing about government agents is that they are armed, and if they knowingly deprive you of your rights, and you resist, or intervene to help someone else who is being harmed, the escalation of force becomes very quickly justifiable. It's well worth looking into the specifics of court rulings involving resisting unlawful arrest if you're worried about this.
I am anti bush, but I am not anti cop, or anti canadian military. I am not especially worried. If there was some reason for the canadian military to overthrow civilian law enforcement agencies, I'm sure we'd have some other concerns on our hands. The only thing that could cause that would be something like a nuke or bio attack, or maybe a complete downfall of the US dollar that leads to a lot of rioting.