After hours of doing a scene myself with lots of figures, that's a lot of figures. Good layout.

Artistically it looks very nice. Your groundwork looks really good!

Realistically a few critiques: It would be best to move the "command figures" out away from under the rotor area and closer to the edges in the 2 to 4 o'clock position relative to the Huey. As well as the running figure should not be running back towards the tail rotor area- a big no no in reality. Also you may want to add a "bungee" courd with thread or wire for the door gunner's 60. Those weigh 26 lbs empty (I used to hump one once upon a time) and are not easily balanced in one hand as you have the gunner doing here.

Looks good overall, but as Stik says, very artistic, not realistic at all.  The decals are silvered pretty badly too. 

The biggest issue is that the USMC did not use any UH-1D/H model Hueys in Vietnam.  Their main helicopters were the CH-34 and CH-46.  Late in the war they did use some short-bodied UH-1Ms, but no long-bodied H models as you have done.

Yeah I was upset with the decals, since I know better to prevent the silvering. I thought the Corps had UH-34's. When I joined the Corps in '75 they had already been phased out by the CH-53, but the CH-46 was still the mainstay.

Nice figure work like the action

Very nice trio of dioramas, I'll just comment here since I like this one best. Guess there are some issues here and there but I really like how the chopper came out despite the silvered decals and the figures are really good.