To get the gold medal on this level you need to shoot down the bombers
with the machine guns and as many of the MIG-27 fighters as possible.
The bombers can only hit you if you fly within about 180 degrees from
the rear, so fly at them from the front to avoid getting hit by their aa-guns.
Your guns can hit a target a little ways before you can lock on a
target. If you are not heading at the target remember to lead the target
accordingly to their speed.