Check this first. In-game open the ALiVE Menu. Click Operations and see if your side has any motorized or armored virtual profiles in the groups list.
Then debug Virtual AI and see if the enemy commander has spawned armored and motorized vehicles around the map.
Also do this: in the Virtual AI module, make sure it’s set to “virtualize synced” units. Make sure to sync the choppers you placed for both sides to the Virtual AI module. Make sure it’s the choppers you are syncing, and not the units inside it.