Are you sure AA missiles can't lock onto ground vehicles IRL? There's nothing stopping them, is there? Also, I don't know how it's now, but previously you were able to lock onto ground vehicles, but the missiles would just go straight.

Hmm I don't know in the real world, but previously, it was unable to target ground vehicles.

ah I mean the bip thing is going on. not like just targeting enemy, but like guided missile, it those bip thing and target the enemy vehicle.