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Does devastator in a tactical squad get an arrow or a triangle on his shoulder?

A triangle.

A marine in a tactical squad is a tac-marine and not a devastator.
Thus tactical marking apply, in your case an arrow.

Yeah, squad markings are the same throughout a squad. All the marines in a Tactical squad would normally have the tactical arrow (or whatever variant you are using to denote your Tactical squads).


That being said, that's the 'standard' set-up. If you're creating a home-brew Chapter and prefer the idea of heavy weapon specialists being drawn from a Devastator company, there's no reason you couldn't give them Devastator markings, with the squad number tying them into the appropriate unit.