Not sure what DMTW has PM'd you, but in general terms:
An MO in the TA is deployable in-role* once he or she has completed his/her pre-registration year and become an SHO (and has been commissioned, completed basic and officer training and received the rank of Captain). It's often difficult to do so at this time, however, as you have professional obligations that can be somewhat interrupted by a six-month tour. So as a general rule, MOs tend to deploy once they have registered a specialisation.
That said, where an AMS TA unit deploys en masse, it has been historically possible to maintain professional development in a deployed role where a designated superior holds or takes over mentoring duties for the duration.
The tone of your message implies that you aren't currently a member of the TA. Feel free to PM me if you'd like more information on your options for joining.