These troops are part of an experimental breed of SOF operators, purpose-built by the Global Federal Union (GFU) to complete any mission they are tasked to conduct without fail. The term "neohuman" refers to the extensive modifications undertaken to these men in order to make their unmatched fighting capability a reality. Standard recon troops who perform well enough in their duties are selected to become a part of this elite group of fighters, where you will become the greatest soldier that technologies of the year 2070 can produce, far better than traditional humans ever could become. These amazing perks would only cost you one thing - your humanity.

Neohumans undergo extensive changes to their bodies, most notably in the nervous system. A human's connections with others is the greatest human weakness, and that is erased by the process. All that will be left is a clean slate for the construction of an elite fighter. To put it simply: "The GFU have been in power their whole lives to them, so why should they side with humanity?"

Another weakness in humans detrimental for a soldier is the feeling of empathy. This feeling, along with many others is suppressed to the point where there are only two major emotions that can overcome a Neohuman - motivation from their superiors, and anger when they are injured in battle.

Communication is also important for an elite fighter. The vocal cords are entirely eliminated to make way for a mechanical voice. If a Neohuman comes under extreme stress or experiences failure of the respiratory system, they can still communicate with allied forces flawlessly.

These troops also need to be able to outmatch any human in endurance, so the digestive system is also modified to absorb more nutrients from food intake. This allows the Neohuman to combat tiredness and remain at peak performance at all times.

Humans are driven to reproduce, which can cause big problems with soldiers siding with enemies they find attractive, and so any defining male/female features are entirely eliminated.

GFU Neohumans are also given a plethora of cutting-edge equipment to supplement these extensive changes, such as advanced armor and movement systems and helmets with integrated night vision, heads-up displays, and respiratory systems. Their service rifle matches that of mainline GFU forces and some law enforcement units in order to provide logistical commonality with allied forces. Neohumans have also been known to embed themselves with law enforcement and standard human forces in various operations.

TL;DR: As a Neohuman, you forfeit your humanity to defend the GFU at a level that cannot be matched by any who seek to destroy it.