In Chopper Attack, you take a chopper and.. well.. attack! You get to choose between eight different attack choppers, each having its own strengths and weaknesses.
After the briefing from your XO, you are set to destroy something —tanks, other helicopters, planes, radars, buildings etc. While the mission only requires you to do something specific, destroying everything gives you bonuses and money, which you can then use to buy more heavy-duty missiles between the missions.
If you look at the screenshots, you might think that Chopper Attack is a helicopter simulation. It's not. Your elevation is fixed. There are no physics. You have boss fights against giant choppers. The game is pure and plain 3D action.