Left the mob in August 2001 on resettlement, almost exactly 1 month before Sept 11th of that year (ring any bells?) and had the distinction of being made redundant from my first airline job before I had actually left the RAF! I could have stayed in, but decided not to - it was the right decision.
I did 17 years in and the job was going the way I didn't like - and it certainly hasn't got any better from what I hear from mates who are still in. It turns out I wouldn't have lost that first job after all, but I found another with an overseas company and now have a lifestyle I could never have acheived while in the mob.
The grass isn't alway greener as my first experience of civilian employment prooves - there is less security. But I don't regret the move.