I'd say that you go by your SSN now, or your service number if you were in earlier.
I'm a 53-year-old Army brat, and without any prompting at all, I can still recite my dad's SSN. In fact, I can come up with it more easily than I can my own, my husband's, or any of my my three kids' SSN's.
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit? FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007
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