Hello.
The problem begins when any type of AI soldier is set as gunner. the gunner actually doesn't shoot at enemy, I don't say they don't shoot at all to anyone but they aim at the target very long very very long even if you will set them the target and if they will somehow fire at enemy its a miracle, setting them on case fire works but when you set them to combat and fire at will they wont pick up targets or if they will they will shoot occasionally, in this case heli with 2 miniguns is... defenseless.