The "skinnies" are a race first encountered almost a decade ago. An incident during first contact lead to an all-out attack by Skinny forces on human interests in the area. The subsequent conflict has been raging since that time.
The walker was first used by Skinny policing forces, before being repainted in their army colours and given a weapons upgrade. Although it looks flimsy, high quality production techniques, long operating range, anti-personnel gauss rifles and a twin railgun battery attached to each vehicle makes it a foe to be taken very seriously.