Your anti-aircraft battalion is located on the border with a hostile state. Aggressive neighbor has repeatedly made attempts to break through the defense. The reconnaissance data indicate that a massive air attack is to be expected soon. The enemy's army is equipped with modern fighters, but you were prepared accordingly. On the large platform of Air Defense are located four anti-aircraft batteries, firing rockets with a powerful charge. Your task - to aim and give a volley in the direction of the approaching air squadron. Nerves are at their limit, you must let the enemy get closer to shoot for sure. The second attempt will not be, the invader must understand that with you jokes are bad.