Board Thread:General Discussion/@comment-1429792-20130627104153/@comment-11051098-20130705213336

It's possible that Kirge was a Stern Ritter, it's neither been confirmed or denied. And as for the rest of the Jagdarmee, it's not certain that anyone else than Kirge has a letter.

I'm with the possibility that the letters are for the Stern Ritters, and having the letter J means Kirge might have been one.