Right-O and your key point as I understand it is that the populace is equiped with rifles and other small arms but nothing larger so that the DHS vehicles would have free reign.
I wonder what percentage of such police-type APC vehicles are vulnerable to .50 Barretts?...or even .338 Lapua?
Yes. Exactly. M113's supposedly are vulnerable to .50 side and back. I also read somplace that MRAPS are designed to resist 14.5mm. Since this has about twice the energy of a .50 cal I would also suspect that they could defeat a .50 cal.