Edward - the initials stand for Dangerous Air Cargo and the BA packs are not a problem. The only consideration when flying a MIRG team is that their Board of Trade approved lifejackets have auto-initiators which would inflate immediately on ditching (very bad in an enclosed space as you can't get out). The MIRG team hand the auto initiators to the crewman before flight and get them back when we drop them on the boat.
I asked the question about NVG compatible cockpits on 139 and S92 many moons ago and was told that you can have them if you pay for them but since the present contract doesn't call for them they aren't fitted. BTW NVG friendly and NVG compatible are not the same thing.
SP I think it's Hamster not Hampster
About time someone took the "p" out of this thread 
Splot