military symbols for defensive operations, frequent movements. concealment and deception. what is this graphic control measure?

The trench gun was a Winchester model 1897 pump action shotgun.

A riot gun is or is modeled on a military M79 40mm grenade launcher. They are designed to fire nonlethal rounds, typically beanbags or riot control gas canisters (CS or teargas).

Michael Codner has written:

'Hanging together' -- subject(s): Armed Forces, Combined operations (Military science), Command and control systems, Communications, Military, Military Communications, North Atlantic Treaty Organization, Organization, Technological innovations, Unified operations (Military science)

A bunch of people not in control is a riot.

Yes they do, as they are dubbed "Creature" Token.

Essentially, Riot Control is very good against populate or very high token decks

"Oh so you have... 15 3/3 Centaurs? Riot Control. Thank you..."