They're actually repurposed military equipment. The Pentagon sells off equipment it no longer wants/needs for military use at very low cost to police departments across the US. The secondary cost is next to nothing, but the practice itself is alarming, probably worthy of another thread.
Still, its a new maintenance / service contract for the manufacturers and the Pentagon have money to spend on new machinery.
It's scary, but at least if Zombies run amok the local police can run them down in armoured vehicles.









