CoH: Modern Combat

I prefer using PLA full mobilization but I was always attacked by apache, any infantries and vehicles can not shot down the apache, any one know how to shot the chopper? it make me frustating because the apache easy to attack without anything on the ground shoting it.

Anyone know how to shot down the Apache using infantry or any other vehicles while you use doctrine "full mobilisation" or "Future is Now"? it make me frustating because everything in the ground are easily to wipe out by Apache. And I think infantry can do it shot down with RPG or any weapon to ...