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If the person is confused he is always allowed to ask, "Which guy is your commander?" and you do have to tell him, just as you have to show your list or codex if they ask.

Completely forgot to shoot with my sniper scouts that were in terrain for 2 rounds yesterday...

Honestly it's not even close to against the rules, though it could be mildly douchey ("mildly" being the keyword, nowhere near TFG levels).
I wouldn't want to do it though, I already feel bad enough that my color scheme might be unintentionally confusing...