The gunships were almost primarilly the B/C Hog/Frog models, since that's all that they were good for. They're shown in plastic models and stuff with these crazy high-vis sharknose, bright colored schemes that they didn't have after the first year in. They show all of this stuff like bright red doors, yellow bands on the tailboom, red ailerons, the USAF logo and "ARMY" or "MARINES" and the sharknose thing.
With the exception of the yellow band on the tailboom and danger arrow, practically all of that was phased out by the third year of operations, starting in the second. Just makes sense-if you see a huey, and you have an RPG, and you're on the VC's side, you shoot it down. If you hear the huey, but it kinda blends in and it's hard to see until it's too late to shoot, you can't shoot it.
I think it'll be hard to rebuild the model into a B/C, but it's probably possable.
I've not done anything with a true repaint/redraw, but I spent a little time making a basic paste-on lettering set for the olive slick for national guard, with more accurate tail numbers. (for 60's models, 6x-Serial No. (5 digits) and 70's (modeled here) x-5 digit SN) I'm not sure about the exact background color, but you could change it if you want. It's meant to be a cut-and-paste with whatever numbers you want. The last 3 digits are white, because they were used as quick identification numbers. The black-background small ones are for the nose, and the small white are for the front doors. (those are all the identifier numbers)
If there's any real demand, I'll redo it with more acurate font and do more in-depth lettering.
(for that, I'll have to reference the photos I have from repainting an actual UH-1D)
(gonna try to use photobucket for foum photos, since both this and the syma s107 foum I frequent need outside urls)

EDIT: not working for me, so
http://s1168.photobucket.com/albums/r49 ... ering2.jpg