As the invasion begins, players choose to battle as one of five unique classes as a member of either the GDF (Global Defense Force – humans) or the barbaric alien Strogg armies.

Each team is augmented with specialist weapons and combat hardware.

Troops utilize over 40 conventional and futuristic vehicles, deployable structures and defense systems; including quad-bikes, tanks, and alien walkers for epic ground assaults or helicopters and anti-gravity ships which provide fire support 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 their progress and gain a tactical advantage over the enemy.

With realistic dynamic lighting and shadowing from headlights, searchlights and even the moon, battles can be fought during the day or night.

Accurate simulation of the atmosphere, weather, and vegetation combine to create an unparalleled degree of realism.

Battlefields are perfectly rendered using MegaTexture, a totally new rendering technology developed by id Software that crunches millions of polygons and a gigabyte-scale texture into a single, seamless and un-tiled landscape with unique detail down to the square inch or the un-obscured distant horizon.

Players can take on class specific missions or join a fireteam to utilize advanced command and communication options including voice-chat and the game’s context sensitive mission order system.

With bitterly contested multi-battle campaigns, each soldier fights not only for victory, but to gain valuable skills, special rewards for teamplay, and persistent military promotions and medals.