That's right, it says arms, not guns and at the time arms meant swords, guns, cannon, rockets and grenades. A well regulate Milita means a military organization with all that implies, and arms today include fighter aircraft too, but they weren't around at the time of the founders, all the rest were. Just as the modern equivalent of a musket is an AR15, so to, is a M777 the modern equivalent of a cannon, ditto for rockets. They shall not infringe on a citizen's right to own a M777 or hand grenades either and that is where you have them by the balls and why the federal government can regulate these things, just as they can regulate guns, another armament. How effective would the territorials be in Ukraine with just small arms? Are the national guard units restricted to just guns, or can they use Javelins too?