Playing on TJ' server against some friends a while back.
I was on the Russian side defending the factory in Western Nogova they were Delta Force attacking at night using Littlebirds.
From a sniping position outside the compound I killed the pilot and shot down one of the attacking Littlebirds with a single shot from my Dragunov at a range of ~200 m in the dark.
Much to the amazement of everyone playing :-) including myself.
Definitely my most satisfying OPF moment (of many) so far