GD territory for sure toque. If the constituion were so easy to inerpret we’d have no need for a supreme court.
FWIW part of your question does have a factual answer. You can own a tank as long as it is demilitarized.
Owning the weapons that go on the tank is another matter. Working machine guns up to .50 caliber may be owned by Joe Schmeaux provided the following are true:
[ul][li]The weapon was placed in the national firearms registry prior to May 1986 and is not a dealer sample. This is the kicker, if the machine gun isn’t already registered for private ownership it never can be according to present law.[/li][li]Joe is not prohibited from posessing firearms by the NFA/GCA.[/li][li]Joe is a resident of a state that does not prohibit private ownership of NFA weapons. [/li][li]Joe has passed the required background checks and recieves approval from local enforecement (usually county sheriff).[/li][li]Joe Submits fingerprints and photo and passes an FBI background check.[/li][li]Joe has paid the $200 transfer tax[/li][li]The BATF has approved Joe’s form 4 required to own an NFA weapon.[/ul][/li]It’s even possible in theory for Joe to own the cannon that goes on the tank. The cannon is classified as a destructive device by virtue of the fact that the bore is more then .50" in diameter and it is not a sporting shotgun. It is regulated under the same law that covers machine guns and sound suppressors. DDs also include things like grenades, certain types of grenade launchers, bombs and explosive shells. I can’t give you specifics but I’m told approval for DDs is extremely rare these days. There are some DDs in the hands of private collectors, mostly WWII artillery pieces.
Note that a lot of collectors have demilitarized weapons. They are made inoperable in a way specifically approved by the BATF, usually by cutting the reciever with an acetelene torch, so that it cannot be readily be made to fire again.