I remember this game quite distinctly, but I'll be dammed if I can find it.
It's a game in which you pilot both a helicopter and a tank ( you start out in a helicopter and use a tank in a later mission, underground).
Graphically, it looks simillar to Recoil, but it's considerably more colourful.
You attack both air and ground targets in your helicopter, at one point in the first mission, you're helped by another helicopter, which you're told will be joining you by someone over the radio who speaks more like a narrator than someone in an army. The first mission atleast is fairly long ( or maybe it just seems that way to me now ) and is broken up by 'cutscenes' where this guy talks to you and tells you what you'll be doing next.
The enviroment you're fighting in looks fairly temperate, grassy. However, later on you also fly to a tropical island. And towards the end you're in a snowy area.
The game ends with you in a helicopter fighting a giant space ship of some sort. After shooting various bits off of it, you fly your helicopter into one of it's bays, blow up it's reactor,and rush out as it begins to explode.The game then ends with a cutscene of your landed helicopter and you, the pilot, standing outside of it, with the spaceship crashed way below into the snowy valley you were fighting in. - This being the first time you actually see "yourself" out of the helicopter.
That's about it. I also distinctly remember that the game had FOUR difficulty settings, and each difficulty setting was represented with a picture of a pilot with various variants of helmets and equipment on. The helicopter missions were also far more numerous than the tank ones, I think.
Oh, and, ofcourse, it was third person. And it was on the PC.