Sljmaster
Your best bet is is to go to your nearest careers office and ask to speak to someone about it. Failing that do you you know someone who is in the RAF who can chat to you over a coffee?
If you only want search engine clues try:
Loadmaster / loady.
Winchman / winch operator.
helicopter crewman.
radar operator.
There are navigators on jets in the RAF and helicopters in the Royal Navy, but not in the RAF helicopter world anymore.