That's one of the enumerated powers. It's not a voluntary sort of thing. They call, you go.
BTW, it has been common in the Western World for probably 4,000 years for communities to maintain armories where they kept "special weapons" and "armor" and other instruments of war ~ e.g. chariots (with harness), larger crew served weapons, battering rams, etc.
I suppose you could have "individual ownership" of such devices, but you'd have to be much wealthier than the average guy living in a wattle and daub hut to keep it in out of the weather when not in use.
You can't deny the right of a community as a whole to own weapons ~ and of course individuals have a God given right to own weapons, but not everything in matters of war depends on you owning your own weapon ~ own a tank ~ now, drive that sucker out of your front yard, and lo and behold you find the soil in your area isn't firm enough to hold it up and your tank will be in a ditch of its own making.
Or, bring your own jet takeoff field so we can have use of your fighter craft to deend against the common enemy.
Actually, yes it is voluntary. Where does it say in the Constitution that it isn't?
Kings were common in the Western world the last 4000 years a well. Said kings liked keeping their populations in check by keeping them disarmed... Sort of like what you are advocating...
Are you really espousing communism? "Community" ownership of property? Not that this doesn't fit with the rest of your mindless drivel...