Hi Mike,
Surprised that you have not had any replies yet but things are usually a little quieter here on week ends.
Firstly let me say that I am not a pilot but my son is, hence my interest in PPRUNE. I worked offshore on the Kinsale gas platforms for many years and many of the helicopter pilots I met were ex Air Corps. I also believe that Air Arran and City Jet have ex AIR Corps pilots. I am sure that there are also some in Ryanair and Aer Lingus.
I believe the Air Corps has a greater requirement for rotary pilots over fixed wing and I presume cadets don't get to choose. Hopefully someone with past experience will come on to advise you more.
Regards
Willby