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All in-service members have a membership number that begins with an introductory code "00T" and is followed by six numbers. For TRS' filing purposes, the first of those six numbers may vary on different correspondence. For example, a "0" and a "5" are considered interchangeable, as are a "1" and a "6", or a "2" and a "7." You may use either of these numbers when you correspond with TRS. Please also note that the introductory code on TDA correspondence may begin with an "AOT."