In my case I wanted out of ISK. When I rang my poster the first thing we had to sort out was my replacement. I suggested 3 names. Two were rejected the third, now coming up for his 3rd tour, was accepted.
He knew what we had done and was 100% pissed off. However he got lucky. The Falklands War blew up and he was in the right place at the right time. Not long after he had passed through sqn ldr to wg cdr.
Try and pick an up popular career path, each step more important or more senior. Everyone else will step out of your way.
Sgt Pilot to V-bombers. Lots of slots and they had to commission him.
Chief Ground Instructor - a slit wrists job. They promoted him.
Unpopluar wg cdr's job. They promoted him. Then he got a sqn.