So what happens in a few years when a submarine pulls up some miles off US coast and unleashes 100 super-automated drones to terrorize the country?

Heck maybe not even a sub needed, some smaller country could have an automated tiny raft too small to be seen on radar tow in the drones

They could charge via phantom power from powerlines and will find a way around GPS jamming

I think you could just ship generic robot dogs in a container and have local contractors straw-purchase firearms, 3d-print cradles, and combine them. None of the contractors would need to know what they were doing.