The first proto-soldiers were one of the PSC Corporation's experiments in creating super-soldiers, secretly ordered and supplied by the "Great Nine" back in the 2120s. They are considered to be unsuccessful samples and therefore they are assigned the lowest-F class.
Pros:
+Increased physical strength
+Medium durability
+ Ability to command over other, regular units
Minuses:
-Uncontrolled aggression
— Friendly fire
-Lack of skin regeneration
-Low intelligence
- A meager arsenal of issued weapons
— Weak equipment