Most people don't realize this but you can hit people behind you while firing your missles forward. What happenes is the missles will circle around and still hit where the target circle is. Just make sure that your in a big area otherwise the missles will hit a wall. Also, it takes a while for the missles to get to the target so if the tank is moving ( usually arn't because they can't tell you're aiming at them) don't bother.