What are the official position titles and chain-of-command of TSA staff at a typical checkpoint and airport? The titles I've heard are Screener, Screening Supervisor, and Screening Manager, don't know if that's the pecking order too. Plus of course, FSD and deputy-FSD.

Are there others? Which ones are normally found at the checkpoint at any given time (i.e., part of the normal screening complement), as opposed to higher-ups that roam from one checkpoint to another or sit in offices somewhere within the airport.