I just wanted to be clear that "well regulated citizenry" did not mean required training or registration.
A brief summary of early U.S. militia history.
The Random House College Dictionary (1980) gives four definitions for the word "regulate," which were all in use during the Colonial period and one more definition dating from 1690 (Oxford English Dictionary, 2nd Edition, 1989). They are:
1) To control or direct by a rule, principle, method, etc.
2) To adjust to some standard or requirement as for amount, degree, etc.
3) To adjust so as to ensure accuracy of operation.
4) To put in good order.