I'm fortunate enough to get to train with the FBI and other regional SWAT teams as a role player in tactical scenarios. I often play the role of an active shooter, usually as a hostage taker. I get to shoot Simunition
at the SWAT teams and they, in turn, repeatedly, blow my ***** away. It is the coolest and most interesting game of "cops and robbers" I have ever played and make no mistake - in every scenario we run, the cops ALWAYS win. I go home bruised and shot up and bleeding sometimes. We train from 08:00 to 17:00 and all day long I am the live "target" for these guys to spend Sim rounds on. Ow.
Part of being a role player is weapons familiarization. Some of us role players are shooters but some of the folks have never even touched a weapon. A couple of times a year the FBI takes us out and lets us shoot up a bunch of their ball ammo (we pay for it after all). The FBI recently switched to .40 cal as their standard issue round and they still have warehouses full of 9mm so we shoot tons of 9mm from their old standard issue side arms the Sig P226. Piles of 9mm brass LOL!
The other standard issue weapons are the trusty Remington 870 (which the FBI only shoot slugs from, BTW), the typical M-4, and my favorite, the H&K MP-10. The MP-10 shoots a 10mm round which is similar in ballistics to a .40 cal which is why they chose to issue the MP-10 instead of the MP-5.
Here's me demonstrating your tax dollars at work.