After a long break from playing, I'm pretty new to 40k, so please go easy with me.
When playing a game at the weekend, we had the question of whether or not you can shoot through your own units. From the rules: "...and be visible to the shooting model. If unsure, get a look from behind the firing model to see if any part of the target is visible. For the purposes of determining visibility, a model can see through other models in its unit." Does this mean that a model in unit A can shoot through unit B to hit unit C if you can see C from A, even if you have to (for example) look through the legs of a dreadnought?
Hopefully that makes sense.