The well-regulated militia in my area is all adults. When the sheriff calls for deputies, we have to be ready to respond. Civic duty. That is what the framers of the Constitution meant. Nothing more, nothing less. Citizen army capable of fighting off a threat...which requires ownership of guns. So you keep guns secured and ready for use and go about your life, and no one would dare invade with a military AND a fall-back of fully-armed citizens. Perfect.