That is incorrect. The National Guard are part of a standing army. They are not the militia.The only legitimate militia is the National Guard, which is under the command of government.
It is not regulations that make a well regulated militia. It is equipment and lots of training.Only a duly-elected government has the authority to establish the regulations necessary for a "well regulated" militia and maintain it well.
Agreed.It is impossible for any other group, gang, club, whatever, to establish legitimacy because it cannot show that it has the approval of the state's citizens to represent them. It cannot be self-appointed or self-authenticating.