Armament 101
First we must know what is meant by Armament. It is the weapons that are mounted on the armored vehicle in order for it to complete its mission. In some cases these vehicles may not be armed so be aware of this when looking at the vehicle. If it is armed it will have guns, missles, or both.
Here is a T-80 with a 125mm main gun.
This is a SA-9 which is a BRDM-2 chassis w/ SA-9 Missles.
This is a BMD-2 30mm cannon and AT-5 Spandrel Missle