Why leave? Because I value me far more than my political masters value me!
I don't mind going to dangerous places every now and again, it's part of the job, I knew that when I signed the dotted line and it can be quite good fun in an odd sort of way. But going used to be interspersed with training and exercises (remember them?). I take the Queen's shilling and when needed put myself in harms way - but it doesn't take long to figure out that living in harms way quite as often as some of us are is just giving the bad guys too big a target, especially with the (lack of) kit we have.
To make it simple to the civvies that keep popping in here and telling us we should expect to get shot it 'cos we're in the military - well yes we should. And we do. But you'd have to be mad to hang around somewhere where they're doing it regularly and any fun stuff has been policed to death!