I'm a doctor, not a mechanic
ExTReMe: Getting sick of all these little ?s so I'm gonna fill some of them in :P PS yes I did just copy my TrainingAS post and modify
TrainingDM is the gametype used in the Deathmatch tutorial (Single player? What's that??) and is specifically tailored for use by the tutorial. I can't think of any real practical purposes for this gametype... It's made for singleplayer and has no subclassing value.