Adopting a tank classification according to missions, one can make a comparison only within a single group, designated for performing specific missions.
In a number of countries tanks are classified according to the old principle, and are subdivided into light, medium, and heavy (based on weight). Light or mechanised infantry, as the more likely enemy, may approach from any direction. Medium tanks are mostly used in defensive roles, rather than for direct attacks like MBTs. MBTs are designed for battle against equivalent vehicles, and have their main armor on the front, while some medium tanks have an equal level of protection around the entire vehicle. Medium tanks are no match for MBTs in face to face combat. The main reason for using lighter weapons on light tanks is that the high recoil forces associated with powerful tank guns need to be supported by a powerful, and hence heavier, chassis. Vehicles weighing from 20 to 25 tons can be called light tanks, while those weighing 30 tons to 50 tons can be called medium tanks, and over 50 tons are heavy tanks. If the weapon system is firing on a high trajectory (firing without seeing the target) rather than a flat trajectory, the vehicle would be a self-propelled howitzer rather than a tank. An armoured personnel carrier has no major caliber weapon, and a tank destroyer hunter has little or no armor. A non-track armored vehicle carrying heavy weaponry firing flat trajectory is a mobile gun system (MGS). They are a specific combination of tracks, armor, turret, and weapon without any one of these four components, the vehicle is no longer a tank. Tanks are tracked armored vehicles that have a rotating turret mounting a heavy weapon firing on a flat trajectory (firing with line of sight to the target).
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