The current US code.
§ 311. Militia: composition and classes
(a) 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.
(b) The classes of the militia are—
(1) the organized militia, which consists of the National Guard and the Naval Militia; and
(2) the unorganized militia, which consists of the members of the militia who are not members of the National Guard or the Naval Militia.
that is it... everyone.. well..except for some civil rights violations like the age and gender thing...
The militia simply consists of every able bodied male... in the 1792 version.. you were in by default and then the states were given guidelines and rules for how to "organize" you.. then not doing there job did nothing to your status.
The current one, 311...is quite clear.. it is everyone. it recognizes that those not in a national guard are still part of the "unorganized militia" you simply can't read it any other way.
It says "all able bodied men" are the militia.. and then it explains that you can be, (1) organized militia or (2) unorganized militia...
as part of the later.. it certainly would appear that you are militia by default.. if you have are a citizen..
You can twist it any way you want but nothing about the second or any of the militia code says that the right to keep and bear arms is dependent on being in a militia or even that being in a militia is not a default proposition.
lazs