Back in the day I sat in on more than a few roundtable discussions with local and state Law enforcement people. (Some of them were after hours and admittedly during the relaxation period)
The talk was “what do we use if" I will not herein go into the ifs as they are not all politically correct.
But first among the solutions were the armored car idea, having firing ports and small arms protection and being immediately available to us (Sheriff’s Office) through state law of commandeering any private vehicle in times of emergence.
Next was a big jump in time, the National Guard equipment. Man what a mess dealing with the rules of engagement.
On down the line was the privately held military equipment. I learned just what and how good some of the stuff we have here in Western Colorado USA is!!!
Oh well memory lane. That was 1985 86.