I agree with Vanya about the unorganized militia. It's an idea that never actually functioned in the past, and I don't see how it could now. Most Americans simply aren't interested in the realities (rather than the fantasies) of being in any sort of military. I freely admit I'm one of those. I'm not suited by temperament, age, or physical abilities to be a soldier. I carry because, if somebody attacks me or somebody I love and I am in fear for my life, I want to be able to defend myself and them. That's all.
And *that* is the right that Heller upheld: not to be in the military (of any sort, in any capacity), but the right to self-defense.