I have a few jobs back home. When I still had my human body, I was a nurse. When I became the Nestene Duplicate, I was a Centurion. Not the highest rank, but it is a leadership position.
Not...sure how it all works out with the Nestene making us think we were human, but weren't, and it was just a trap for The Doctor, but I did retain the leadership skills.
Basically, I was technically already a militaristic leader before my universe started ceasing to exist.