Helicopter and AAA

[gila]

Choppers are not stealthy,everyone knows when one around,so you'll get alot small arms fire most of time they just fly back with no damage.
Vietnam era they will best suited for transport/and or rescue if possible, and also mopping up enemy retreating and routed units after AAA threats are silenced.

[Suhiir]

The AI will almost always buy AA units (to many IMHO).
And they will always fire on aircraft/helos by preference (duh).

So if you're using aircraft/helos in the game get use to huge volumes of fire being directed at them.
And even with lower hit percentages eventually they will be hit.