All tanks have very heavy front and side armor. However, the tank's rear is lightly armored. Smaller tanks can be hit with a rocket almost anywhere and will usually explode. However, larger tanks must be attacked with an explosive from behind. If you shoot it from the front or side, chances are you will not even make a dent. To take out the tanks with the satellite dish on top, shoot the satellite dish with a sniper rifle and the tank will explode.