Black helicopters can only be MJ-12.

I used the Bluestream Airlines HH-65 for the base texture on mine. Of course the
real non-existant black helicopters supposedly have no markings. So I also put the gold pin-striping tape back in the drawer.

It's hard telling on the HO IV. One of the things about it is that the covering of the wings are designed to be somewhat transparent, so there may be something in the model file itself that over-rides the alpha channel. :-/