what kind of stuff are they spraying and can a civilian get some?
Bear spray?
It's called pepper spray and you have to check your state to see if it's legal. However, I believe bear spray is legal most everywhere....NOt that I'm advising using that stuff (Me? I always travel with my friends, Messrs Smith and Wesson) I'm just answering a general question. Oooh, wouldn't bug spray be cool? It paralyzes the bugs...have you ever gotten it on your tongue or lips? Numbs 'em right out!
Pepper spray for bears, works good, long range spray and can make a floating vapor cloud.