Here's the kind of bullet your armor has to stop:
With a sufficiently successful active defense system, there becomes no need for the actual heavy armor.
At some point you will just need armor thick enough to stop bullets, and then you can rely on the active defense system to stop anything larger.
This may allow for future tanks that are much lighter and faster. Of course we are moving into the territory of not needing manned tanks at all.
Skynet is coming.
Here's the kind of bullet your armor has to stop:
