I was ex TA REME and MN engineer when, at the age of 23, I left IBM to join the RAF.
Other than for pilot training I would not have joined. I was already an engineer and would probably have gone back to IBM or to a power station. The MN demonstrated the difficulties faced by navigators transferring out of their profession so, when I was asked at Biggin Hill, if I would accept nav training, the answer was a polite "No, Sir."
That's just me - then. Now, for someone else, is different. I'm not saying that you should ask "What's in it for me afterwards?" at the interview but you should have considered that before applying.