i dont think you can. since Anti_ground in the weapons section means all types of ground, infantry, buildings, and the like.
You can force it to target aircraft with the missiles as its primary targets.
Just put the Aircraft under the primary preferred against.
The tank is going to try to use the cannon against planes primarily, but since it can't it will automatically resort to its AA weapon.
So itll attack air threats first, then ground threats... but thats all you can do.
If you could make damage types, you could do something about that, but you cant.
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