From Activision: As the invasion begins, players choose to battle as one of five unique classes in either the EDF (Earth Defense Force – humans) or the barbaric alien Strogg armies, each augmented with specialist weapons and combat hardware. Troops utilize over 40 conventional and futuristic vehicles, deployable structures, and defense systems like quad-bikes, tanks, and alien walkers for epic ground assaults; or helicopters and anti-gravity ships to lend firepower from the air. Throughout each battle, teams establish bases, deploy defense structures, artillery, radar, and advanced forward-command systems into enemy territory while constructing and demolishing obstacles to speed progress and gain a tactical advantage over the enemy.