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Tanks are legal to own in the US IIRC (with a federal permit). Arnold Schwarzenegger has one. They are also street-legal in some jurisdictions if rubberized tracks are installed and the tank is less than 50 tons. Here's a dude buying some fastfood in one: https://www.youtube.com/watch?v=vvkLaa9bogU. Here's an APC: https://www.youtube.com/watch?v=v5tTSfWMeNo

they let armored cars, dump trucks, snow plow trucks, cement trucks, etc... on the road..

Those things typically require special drivers licenses though.

Back to the original post, will they have a dedicated "Tank" license?

All of those are:

a) Not driven by the general public.

b) Niche and not as common on the road as the Cybertruck is planned to be.

c) Slow to accelerate meaning it's much harder to drive them dangerously.

They let armored cars on the road.