The amount of weapons in the US are enough to fight two world wars; what I'm worried about is the proliferation of terrorism in urban centers and how the Military could deploy advanced drones and AI robots to patrol cities, these drones and robots will be able to take human lives at any given time.
The final showdown will be humans VS machines.
Once the GOV deploys defense AI machines in US soil, it will be impossible to stop the global proliferation and arms race.