I don't know, that's why I asked the question. I thought we were discussing CSS positions, but sure. What's the purpose of an AJAG SM, in a branch/work environment where the junior rank is a Captain? Certainly not to deal with dress, deportment, or discipline issues. Nor is it as a technical expert, as there is no NCM legal occupation. From my experience, they assist with advising and training unit level disciplinarians on how to handle CSD issues, charge laying, investigations, etc.
A MWO fresh from a sub-unit Sergeant Major appointment, where they deal with it first hand, is probably well-positioned to move into advising and assisting at the AJAG level. In fact, where I've been, its the MWOs as opposed to the CWO that handle the day-to-day management of disciplinary issues.