CJballer
Dust Weathering:What you can do to weather your vehicles to give that dusty appearance is using your Airbrush to give the lower half of your vehicle a very thin dusting layer. You spray really thin a color like khaki, Buff, or a light earth color.
You can also achieve this dusty appearance with drybrushing use the same colors as noted above
And pastels can work very well as dusting make some sort of wash from water and pastel powders from the same colors as noted above and apply this with a brush.
Bullet holes:What I usually do when I want to make bulletholes is I take a needle heat that and stick that in the plastic on the place where I want the bullethole to be I stick it in while it`s hot and turn it a couple of times around to widen the hole a little. Then I pull the needle back wich makes the plastic come with the needle and sticking out of the vehicle itself wich looks quite stupid. What I do to get rid of this "sticking out" plastic is grabbing my exacto or whatever blades you use stick that int the center of your bullethole and twist that around in that way you cut off the molten plastic. Paint it in gunmetal and Voila bullethole
Making the Black Hawk fly.Well You could solve it with fastropes I have heard a lot of people about that. I haven`t seen Black Hawk down yet and I don`t know that much about the conflict there and I surely can`t tell if they fastroped from a Helo If you do it with fastropes then you migth consider that you have guys hangin in the ropes that are fastroping and that is some really heavy scratchbuilding.
You might look at this:
Treacherous Crossing This is a dio on Dynamic Dioramas and the guy who made this dio attached his planes to the trees and it looks really good. Maybe you could do something with the landing gear and attach it to a building with a piece of transparant sprue.
A dio with the Transparent sprue can be seen here. A nice dio that shows some cool action
Rangers in Somalia I hope this is of some help