For info on Vietnam Hueys, check out this thread. It will take a while to get through, but should answer all your questions.
Good luck on it. It is a dog of a kit. The interior is lacking details and it is way over-simplified. Personally, I wouldn't waste my time on it, but if you just have to have a 1/24 Huey, its all there is. I'll stick with the much better detailed 1/35 versions.
Gino P. Quintiliani - Field Artillery - The KING of BATTLE!!!
Check out my Gallery: https://app.photobucket.com/u/HeavyArty
"People sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf." -- George Orwell