Hi Guys,
Whatever about having Irish Air Corps or IAC written on the side of the fuselage I don't think there's any need to change the Air Corps roundel, is has been in use in one form or another for over 40 or 50 years now and it is universally recognised as being the marking of the Irish Air Corps, it is a very distinctive roundel and I would say there would be a bit of confusion if it was changed.
Anyway, that's my 2 cents.
Regards,
Frank.