Make it possible for the Earth team to spawn as crows and ravens! They should be able to drop bombs and fly faster than Spitfire, but have low HP and weak melee attack.
A crow? Why not something cooler like a mini flying robot, or something.
Consider we teach crows how to attack, they’d do little to even no damage on an alien as of how they can actually hurt things can easily be weakened.
I do think instead, we should have a varying of controllable robot drones to some extent that can do stuff like this, though dropping constant bombs, if that’s what you mean seems a bit op depending on the map. Also, humans have sort of already trained crows in reality, and the only thing they really do is pick up coins from the streets, drop them into a coin machine and get peanuts.
Ah, so they could help with getting credits!