They're cleary aware there's drones above, yes. They seems exhausted, we don't know for how long they're under attack but fatigue plays it's role. They also don't have any counter-measure, and are not trained to act a certain way.

Without good fortifications hiding you from the enemy sight, there's actually not much you can do to protect yourself. At some point it's just every man for himself. You can always give away your mate position, as we can see here, it only works for a brief moment.