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Another thing to try are thermal goggles. You can find them up the top of the mast on the tanker, an these will allow you to see tags more clearly. That way, if there are any tags on guards in the center audience, you`ll know which ones to get. To do that, just put the audience to sleep and single out your man.
Before you know it, you`ll be racing around with stealth and all the various wigs and stuff.