I can't answer that one- I had a civilian account first, and then, when they began offering military, got my military account- and they now both show up under my single account number.
I have heard that others who have added military accounts nowadays have two numbers. Perhaps you can call the thrift line and ask them how to do it, since obviously it's already being done elsewhere, and you just want what others are able to already do.
Let me know what kind of outcome you get.
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