You may want to stop using that argument. Let us take a look at the United States Code regarding the militia. Specifically who the militia is composed of…
http://uscode.house.gov/download/pls/10C13.txt
In case you don’t want to dig through the code here is the part that matters…
(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.
So there are two classes of militias in this fine country. The first consists of the organized militia which would be our military forces. But the second is the unorganized militia which consists of all able bodied males above the age of 17 who are not enrolled in the organized militia.
Of course the second amendment states quite clearly that “the right of the people to keep and bear Arms, shall not be infringed.” In the entirety of the United States Constitution “the people” refers to the citizens. But I digress this post is to point out the fact that the anti-gunners don’t actually know what they are arguing.