Thanks Ray
I've taken a few screencaps from the film (using VLC) and put them into a collage for identification, just to make sure (admittedly they're not all that good).
img836.imageshack.us/.../vlcsnap2013042123h54m27.jpg
img836.imageshack.us/.../vlcsnap2013042123h54m27.jpg
And this pic (a slightly larger version of the bottom left pic on the collage above) - img442.imageshack.us/.../vlcsnap2013042123h57m14.jpg
img442.imageshack.us/.../vlcsnap2013042123h57m14.jpg
Looking at those pics I can now see it is a UH-1B as you said Ray, it appears to have the "bell mouth" intake, which as far as I understand it is related to the UH-1B, whereas the UH-1C has the particle separator like on the Revell kit, although your pics of a UH-1C above appear to show the "bell mouth" intake also (a little confusing I have to say).
The tail shape shown in the caps of the film leaves me a little confused though, it's a bit different to the one on the Revell kit, in particular it looks different towards the bottom where it meets the tail boom area of the fuselage.
I'll just go with sticking the M21 system from the ESCI kit (which is nearly done in my opinion, pics will be posted in a couple of days hopefully) on the Revell kit and make the kit up as it is I think (I'm loath to cut down the UH-1D's rotors as I need them for the UH-1D, and getting hold of an old kit (Lindberg or Monorgram) with a "bell mouth" intake to use seems impossible, and I'm not good enough to scratchbuild it). I've made the M21 system detachable from the UH-1D anyway, using tiny magnets so it's easily done to put them on the Revell kit. I plan on making the M16 system detachable in the same way also so I can swap them around.
As I understand it though the mounts on the Revell kit that go under the fuselage are incorrect, would you happen to have any close-ups of the actual M16 system mounts Ray, I might be able to scratch build them from thin plasti-card, or cut in half and file down the ones Revell supply with the kit?
Decals are easy to do for the heli in question because there is only the 1st Air Cav symbol on the nose and either side of the tail, the blue triangle on the cockpit doors, the number on the nose, and the US Army decal on either side of the tail boom. Can't really spot any others so far. There does appear to be some black writing on the tail but I can't really see what it is. Doesn't quite look as flash as the Marines HML-267 livery but I've gone off the idea of painting that.