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TAC//PAC
Personnel and operations
Use the Steam account you play on. Members can keep their own details up to date; admins get the whole manager.
Why Steam? Arma knows you by your Steam id and nothing else - Bohemia provides no sign-in of its own - so it is the only name that matches the roster the game writes. You type your password to Steam, never to this site, and no password of yours is stored on this server.