Special Warfare has come a long way since its inception. Ordinary men perform extraordinary feats as they step up to serve a calling. Know those who came before you.
An expert is somone who knows everything about their craft. As an Officer, your craft is leading men as a ground commander. You need to know everything about their job and where you all came from. You need to understand where they are coming from. They will be technical experts in their individual craft, but you need to know how they all function and what their jobs entail.
Perfect your craft. It is never ending.