Evolutionary Experimentation Program

The Evolutionary Experimentation Program (EEP) was an experiment run in Vault 87 on the orders of the United States government, and in collaboration with Mariposa Military Base to create improved soldiers for the American military using Forced Evolutionary Virus.

Background
Unknown to their fellow vault dwellers, some inhabitants of the vault were subjected to the experiments. Although reportedly having died from an "unknown cause of death," they were in fact exposed to a genetically-modified version of the Forced Evolutionary Virus.

After infection, both male and female subjects initially change to an asexual state, with the males improving in upper body strength, and both males and females receiving a thicker and more resilient skin after ten days. However, the project ultimately failed, as one female died due to massive loss of her brain fuctions, and all other subjects had to be terminated after fourteen days, after experiencing increased levels of anxiety and rage caused by rapidly diminishing mental instability, becoming super mutants.

The version of FEV found within the vault produced super mutants slightly different than other mutants. Generally, they were less smart and more hostile. Though they do not have deformities like blisters and deformed body parts.