In the widest sense, the whole military force of a nation, including both those engaged in military service as a business, and those competent and available for such service; specifically, the body of citizens enrolled for military instruction and discipline, but not subject to be called into actual service except in emergencies.
If the guy out in the woods with the Michigan Militia is a real estate negotiator, instead of some crackpot, and has a normal life, that's unnerving. You don't want to think it's as normal as the guy next door, hedging his lawn. It's easier to demonize or separate them off from 'us.' Michael Moore