If you are interested in more info on Ia Drang and the helos that participated in it, check this thread out:
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If you would just like to build a Huey to honor your cousin, I respect that and build whatever you'd like. He would have been inserted by a UH-1D most likely of the 229th AHB. It would have had markings similar to these. This is a Army Aviation Heritage Foundation Huey restored to 229th colors:
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If you would like to build a gunship like the ones that participated in the battle, you are pretty much gonna have to build an M3 bird of some type from what I can tell. the 2/20th ARA (aerial rocket artillary) was the major gunship support for the battle. Here are some of their birds from the 1965 time frame. Without the nose mounted M5, the Hueys with either the 19 shot XM159/M200 pods or the 24 shot M3 system were referred to simply as "Hogs"
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Another possibility is a bird armed with the "Maxwell system" which was usually twelve rockets and one SS-11 missile on an outboard pylon. Of course, you'd have to make the missile somehow.
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The only gun system in country at that time would have been the M16 system which used 4 M60C's and XM157 7 shot rocket pods. Neither of these come in any of the MRC/Academy boxings. You can get the quad 60 set from Cobra Company: http://www.cobracompany.com/35026.htm I'm can't think of a source for the rocket pods right off hand. Anyway, while this first pic is a UH-1B, the 2/20th was also one of the first units to field the UH-1C and the last pic is actually a UH-1C fitted with the M16 system.
This first one is actually a "Firefly" ship used for night time perimeter security:
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Here's the UH-1C:
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Those are pretty much your choices for period accurate gunships. I hope this helps you decide what to build. If you decide to go with a later weapons configuration, just let us know which one and I'm sure we can help you find photos. By the way, the Siminar 1/35 UH-1B kit does come with figures. Be sure to separate the rubber ammo belts from the rotor sprue as soon as you get the kit. It will probably already ahve eaten into the plastic, but maybe you can minimize the damage.
Ray