Howdy!
Looks like I made it! Here come the hueys:
First chopper: UH-1D, 66-7854, B Company of the Longhorns, 1st Avn Bn, 1967
Second chopper, the one You were looking for: UH-1D, "879", B Company, 229th Avn Bn, An Khe, december 1965, Pilot R. Mason
Third chopper: UH-1D, 64-13288, 335th AHC "Cowboys", black-OD camo. The geometrical insignia also on top and bottom surfaces of the horizontal stabilizers.
And, while I was already at it, a bonus:
First chopper: OH-6A, 66-7927, D Troop, 1/4 Cav, Phu Loi, 1969. It says here it was flown by Hugh Mills, maybe Mr. Mills could comment on this one and say if the drawing is correct?
Secon chopper: OH-6A, 67-17793, A Troop 7/1 Cav "Apaches", 1970
All images from the book "Wietnam 1950-75 Wojna śmigłowców" by Piotr Taras, AJ Press, 1996. The book is highly recommended, even if only for the pics, because it's in polish. Anyhow, I'd be glad to translate from polish if anyone has such a need. Happy modelling to all, and have a nice day
Pawel