@SeanCasten The well regulated militia is the National Guard, the existence of which is supposed to prevent federal tyranny by avoiding the need for a standing federal army to operate on US soil or operate abroad without a Congressional declaration of war for that matter. Since we have a permanent federal army always operating abroad, we’ve violated this principle since at least WWII and thus haven’t restrained the military industrial complex as Eisenhower warned.
https://www.amazon.com/Second-Amendment-Biography-Michael-Waldman/dp/1476747458