Well, maybe you guys can help me out with this one.
It's a PC game, Made somewhere between 1995 - 2000
It had a sequel that seemed very different from the Original in that you could actually play as both humans and aliens in death Matches.
The original game was about an alien invasion on Earth. You start somewhere in Africa, in a US Military base, controlling a turret. After successfully repelling an attack, you get to drive a helicopter, then a jet, and a futuristic tank all of which you could repair at certain bases. The other locations were some place that was covered in snow, some city, then finally an assault on the aliens from the moon. You use nothing but vehicles or turrets and every location had a certain number of missions. That's about all I remember at the moment