My original comment concerning the Hummer being an acquisition was based on the caption I recall seeing on the Grizzly / Hummer pic when I first saw it on the internet somewhere awhile ago. Now seeing the Hummer logo on the tailgate, it's obvious that they are civilian pattern vehs that have been heavily modified. I'm only assuming that the riot control arrangement of the vehicles isn't a Hummer option!
They really aren't 'civilian pattern' now, eh? I wonder how many they have? I bet the vehicle history is interesting.