To my knowledge, this was a collaborative decision between Spec Ops and JRS. I'm sure Steve (our DL) will add to this, but it was not an easy decision as each side has a good case and equal opportunity. Keep in mind, that even though a decision was made between the detachments -- the LMO can still override and place the costumes where THEY feel it will best serve the Legion. It's not always an easy process (as with the Shoretrooper), but works out in the end.
I've watched the entire BF2 movies, and agree the characters seem more "special operations-ish". But they are also pilots. And the helmet is pretty much a Tie Pilot helmet -- minus the breathing tubes. Plus, the chest box. But again, it comes down to "what serves the Legion best" and provides each Detachment room to grow. Spec Ops has plenty of costumes and work in progress on new costumes. While, JRS does not.
So...I'm cool with the decision. Hope this helps.