For me it was the pension change. I don't have long to go and fully intend to leave with my tax free lump sum and pension for life.
Every other erosion of 'Ts and Cs' might seem just like whining and we've heard them all before, so I won't repeat.
Sadly, on the Sqn that I work on, I'm seeing practically all of my generation leave ( mainly for the airlines, but not all) simply because they're tired of it all.
I understand that the RAF is now short of QFI's, so I can really see problems ahead.
And more alarmingly, a good majority of the generation below me ( 30-35) have their licenses ready to go.