I'm new to the game, I haven't even actually played yet, but I have begun to build a Tau army and was wondering on what to and how to equip my XV8 crisis suits. I figured I wanted to make the squad specific to one task and therfore believe I will equip them with missile pods and plasma rifles to be a good mid range unit. My question is, if I want them to fire twice, which I believe they are capable of, do they need to be "twin linked?". I don't understand what that means and was wondering if there has to be anything physically on the model to represent that?