The YE 31 NMX Light Tank was developed early in the Second Mishhuvurthyar War as a fast vehicle for assaulting enemy ground installations and light vehicles like the Type 30 Surface Terrain Vehicle.
The Type 31A is slightly slower due to additional armored shields over its forward treads. It also moves the missile launchers to the turret, which is lowered. The 31A model replaced the original Type 31, but the older tanks are currently more common and will be used until they are all destroyed, with the 31A replacing them.