*********************SPOILERS********************* **
Don't worry. There are no tags to be collected in the colon. Just run past all the guards and get up stairs. Go across the catwalk and to the left their is a door that leads to a cutscene.
Once you get your guns from snake, dart him for his tag. I believe It says Pliskin, or something like that.
Hope this helps.
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Semper Fi!
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