Antichopper DLC is available!
In Chopper: Lethal darkness we are shooting enemies from attack helicopter using Night Vision Device.
With this Antichopper DLC we can learn how it looks from the opposite side. Try yourself in the role of assault vehicle shooter under deadly fire, and shoot down the enemy chopper - if you can. You have the opportunity to join the battle at any of the available points, or even your own, if Sandbox DLC is present.
This is the most ambitious mod I've ever seen for a game I have never even heard of.