Many years ago, on some Canadian Air Force base, there was an exercise. Military personnel in civilian were simulating violent protesters. On airbases there are neat fire trucks with water cannons. Some shithead Lt ordered the firefighter to turn that water cannon on the protesters. And actually fire it. It was glorious. Said Lt did not endear himself to the local Wing Commander by this feat, but at least he proved he wasn't some limp dick. The end.

(It did make an unholy mess, as there is foam in that water)