I've gotta credit Andrew Branca with pointing this out and fucking my brain for a moment.
In the 1938 case of Miller vs. USA, the case was about the possession of a sawed off shotgun. The case made again Miller was that such a firearm had no practical use, and no military use, and -- therefore -- should be banned.
Now, is it's the guns that do have practical, militarily functions, that these freaking people want to ban.