I have actually known people from some other forums who have built home made flamethrowers and cannons and stuff. They even showed pictures of them. Believe it or not, in many parts of the US its legal to own high powered weapons, flame throwers and cannons and stuff. If you could afford it, it is even legal to own tanks. It is actually very easy to go out and buy body armor and an assault rifle and boom, your equipped like a solider yourself. It would only cost you a 1000-2000 dollars. Armor piercing rounds are legal in most places too.
People in the US are nuts. You don't want to see that sort of stuff break out here in the US, people will die and our army has no way to stop them.