Check composition:
Main background - big nuclear mushroom
Second background (first is behind of this) - from left to right:
Cannon vehicle (like this:
)
Rocket Launcher vehicle (like this:
)
Heavy tank (like this:
)
In a mid - three soldiers walking with guns and full equip.
After them - heavy armed truck (like this;
)
Jeep with minigun upon (example:
)
And last can be a machinegun (like a first one i showd, but with machineguns instead of one cannon)
So, as a end of composition - A heavy armed helicopter between nuclear explosion top and soldiers.
As a overall background and color setting: green+dark red on soldiers, yellow and orange on nuclear explosion, dark blue and saturated red on main background.
Project name is darkblue+black. Also, a background can be lined like this (with blue, light blue and dark blue colors):
