Shoot your enemies to defend your fellow soldiers and your base. Hidden in the hill you have a perfect view of the enemies flanking your camp. Kill them before they kill your friends. If your friends die you have failed your mission. Use your mouse to aim, shoot, and zoom in on your targets. Use R to reload your gun. Each level has more enemies that will flank your base. Kill and/or injure as many as you can. Your friends will also be defending the base from directly in front. Your job is crucial and you cannot fail your base.