A. "Militia" is not, and was not the equivalent of the National Guard. As I understand it, the militia is a group of volunteer individual civilians organized to defend the populace. The State or National Guard are not volunteers in the same sense. The State and National Guard are part-time, professional soldiers.
B. With regard to the tired argument that the right to bear arms is a right for the State to form a militia, consider that the word “People” is used three other times in the Bill of Rights.
Amendment IV
The right of the people to be secure in their persons, houses, papers, and effects, against unreasonable searches and seizures, shall not be violated, and no Warrants shall issue, but upon probable cause, supported by Oath or affirmation, and particularly describing the place to be searched, and the persons or things to be seized.<\i>
Amendment IX
The enumeration in the Constitution, of certain rights, shall not be construed to deny or disparage others retained by the people.<\i>
Amendment X
The powers not delegated to the United States by the Constitution, nor prohibited by it to the States, are reserved to the States respectively, or to the people.<\i>
The rights described in the Bill of rights are not a right of the States (which would not have been necessary), they are rights if the individuals.
Presser v. Illinois, 116 U.S. 252 (1886) says, "It is undoubtedly true that all citizens capable of bearing arms constitute the reserved military force or reserve militia of the United States as well as of the states ...
And, current US Code, at 10 USC 311 says, "The militia of the United States consists of all able-bodied males at least 17 years of age and, except as provided in section 313 of title 32, under 45 years of age who are, or who have made a declaration of intention to become, citizens of the United States and of female citizens of the United States who are members of the National Guard."
That gun grabbers imply that "militia" is tantamount to the army, or national guard, or similar government-organized institution, tells me that the gun-grabbers are liars of the lowest type.