The US government has been remiss in supporting militias. They should be issuing AR-15s, not trying to ban them.
But the question is moot because (for the third time in this thread):
The Supreme Court has very clearly stated that militias have nothing to do with it, hence arguments about militias are pointless.
Held:
1. The Second Amendment protects an individual right to possess a
firearm unconnected with service in a militia, and to use that arm for
traditionally lawful purposes, such as self-defense within the home.
SCOTUS, DC v Heller, page 1 [emphasis added]