KSoon, I am MMS as well and here's what I got. Torpedoman's Mate (TM) was disestablished on 1 October 2007. Surface TMs were merged into the Gunners Mate rating and submarine TMs were merged with Machinist Mate (non-nuclear) rating, becoming MM(W), Machinist Mate Weapons. After "A" school, we will either follow the Auxiliary pipeline or follow-up Weapons courses. I'm not sure wether we get to choose between MM (AUX) and MM (WEP) or if the Navy assigns us based on its needs. That being said, you can find a list of Sub-Specialties available for MM here..
Click Me