Re: Defending against the government in the US
Indeed. Certain of the lunatic fringe seem to think it would be the general public vs the US military.
Of course, in a civil war - an actual, proper civil war where a country tears itself apart - many serving personnel may well defect - soldiers and airmen have families as well, and they're going to be one side or another. Ergo, far from a well organised military vs a popular militia, it'd be elements of the US military, with their hardware plus new recruits, vs other elements of the US military with their hardware, plus new recruits. Which side counts as the traitors and defectors depends which side you're on.
Your little stash of AR15s starts to look a bit pointless when the local military base is overrun because the guards abandoned their posts to go home and your neighbour is tooling down the street in their looted Humvee sporting a roof-mount .50BMG or TOW launcher.