If you look closely at the history of the American Revolution, the Second Amendment also 'included' cannon and ships. One of the striking military aspects of the War of Independence was the fact that the Brit regulars did not have a monopoly on any class of materiel available at the time. Guns? The colonists had lots of those. Cannon? In a pinch, the colonists could forge their own. Ships? Smugglers' ships don't require much conversion to be used as war ships.

How different from today...