He does, but it never gets used in the series and only appeared in the credits. There's a very specific reason why he doesn't use it, but that only comes out in Interrogation Techniques, which is umpteen stories on in this fic-verse.

But I'm happy to disclose now if you like! It does appear in other people's fic's and in tags etc, so its not secret!!

Looks like you took a tea break and have now come back for more!! I took a look at your profile and drooled over your John/Rodney banners. I love that pairing!! I got into SGA entirely through the fic.