Lightning

The Lighting is a common-pool light tank available to all factions. It is called the lighting because of it's high speed. The lightning is outpaced only by the similarly-named Flash, and can sometimes top out at 70+ kph. In terms of armaments the Lightning is most notable for it's Skyguard alternate weapon, which can devastate aircraft. It's default weapon, the Python, can be effective but is week enough that most battles a Python-equipped Lightning engages in will be losses. Because of this Lightnings are sometimes best used as defensible one-person transports, or super-ATVs. The exception is the Skyguard, which no attacking platoon should be without.

This link goes to some extremely high quality pieces of concept art. While they do not have any semblance to gameplay or in-game appearances they are very interesting.