Board Thread:General Discussion/@comment-71.22.182.56-20141012085213/@comment-25142096-20141012090926

There isn't much you can do for that challenge, I always got it when using 5 supplied a day, on the 5th or 6th day of the challenge. It depends on how you allies fly, the one close to the ground will most likely be aimed by a lot of AA Guns and SAMs, leading to tons of rescue bonuses. In order to complete this challenge it would be smart to let your teammates go first in the action, but that means losing precious points in the battle. Anyway, in a 8-player mission it'll be way easier to get rescue bonuses.

TIP: You get a rescue bonus whenever you destroy an enemy with a red arrow on it (which indicates when it's targeting one of your teammates).

I don't do this challenge anymore as playing normally gives me tons of money (20-25k with one fuel, if I don't have anything in research), but at the time I was doing it, I played mostly doing ground attack.