The battlesuit is the ultimate human armor. Heavy and expensive, it protects the entire body from a wide variety of alien attacks and provides some defense against poison. While horizontal mobility is not fully impaired by the battlesuit, the human is no longer able to crouch. A human wearing a battlesuit also has better aim while using a chaingun due to a reduction in recoil.
This model will require all of the animations possessed by the human, but for the modeler, the following applies: textures should be 2048 for the diffuse, and it will also require normal, specular, gloss, and optionally glow maps assuming you want to add some glowing bits. Target poly range is 6-8k, but this can be overshot if you absolutely can't get it lower.
Concept art by PhilZero:
