Question about converting military helmet

Hello I've not posted on rah before, but have lurked long enough to
realize that you guys have
a few electronics experts among you. What I have is a Gentex sph-4
military flyers helmet.
This is a single plug helicopter helmet. I've been told that the
microphone impedence for
military helmets is different (sorry guys I don't have the actual
values) from civilian helmets,
and I have tested this helmet in a helicopter. The earphone portion
works fine. My question is what must be done to this helmet to make
use of it in a civilian helicopter? Is it as simple as
replacing the existing mic with a proper resistance civilian mic? Or
is it something more tricky
and electronically sinister? Any thoughts would be appreciated, thanks
in advance!



Get yourself in the air, no matter how you get up there!

Wayne