> Which is clearly a dependent clause of the subject, “A well regulated militia.” Every other amendment in the bill of rights follows a similar structure.

I wonder if that means the lack in the US of official citizen militias dependent on private firearm ownership could be considered unconstitutional.

IIRC, the National Guard is reckoned to be the militia, but that seems a little like BS to me. It seems pretty much to be a de-facto component of the federal military, complete with rotations to fight foreign wars, etc.