Around the world have been deployed building complexes of World Defense System, which was supposed to bring armed conflicts to a minimum. This would put an end to the terrorist activities that did not like its participants. Terrorists threw all their forces to the destruction of WDS at the beginning of its creation, before it will not too late. Your goal is simple - prevent terrorists to destroy containers with parts of WDS! Use defensive turrets and landscape features to increase the productivity of your actions. Enemy forces far superior to yours, but you have the latest technology. So do your job - destroy them all!