Enemy Territory: Quake Wars

At the start of the invasion/game you have a choice of two sides. You can either side with the nasty alien Stroggs, or you can side with the humans and defend your home planet Earth against an invasion from space in the ranks of the EDF (Earth Defense Force).

Soldiers on both sides have at their disposal current and futuristic fighting vehicles and defense systems including quad bikes, tanks, buggies, helicopters, anti-gravity ships and fear-inducing alien walkers. During each battle, teams on both sides first build a base, develop defensive structures, deploy artillery and radar, and then either defend or make a run deep into enemy territory, overcoming a variety of obstacles to advance along the way.