1. Place west rifleman in stratis airbase in one of the tent hangars
2. Place civilian man as playable next to him
3. Place empty vehicle next to them. In this case cheetah (west anti air armoured)
4. Place east (csat) mi48 kajman flying maybe 500 m away and so that it does not see inside the tent hangar
Now it depends totally on which person enters the vehicle whether the chopper will engage the cheetah. The vehicle can also be civilian or csat, it does not matter. The chopper will kill the vehicle with west soldier. I tried with an ifrit (csat vehicle) and hatchback (civilian) and tried also by removing weapons and uniform, same thing, maybe took a few seconds longer for the ai to engage, but still.
You can even try to shoot with your rifle as west soldier and you get killed, but as civilian you can let loose several magazines and nothing from the chopper.
Forgot to mention. Drive out of the hangar. The hangar seems to mask the unit from enemy radar, as it's probably supposed to, i imagine