The world is at war and being one of the special unit forces, you need to do your part and take out the invading armies. This won't be easy since there are many enemies, but the world can only depend upon you since you are the best. The idea here is to destroy every enemy you meet because everyone is trying to kill you. You can pick up some powerful weapons on the road. You need to eliminate all of your enemies as fast as you can since they would swarm you. And the game would be harder because of that.