The construction of Mariposa started in October 2076 when large progress was made in FEV research, and the government preferred to move the project to a location under military supervision. On January 7, 2077, Major Barnett ordered transfer of all FEV research to the newly-constructed Mariposa Base, despite objections by the research team.Along with the scientists, a military team commanded by colonel Robert Spindel, which previously monitored the experiments at West Tek was sent to Mariposa. Spindel's second-in-command was captain Roger Maxson. The FEV project was moved to Mariposa and tested on human subjects. The vats were giant tanks filled with liquid FEV. As part of the research project, human subjects were dipped inside them and then examined to learn how to control and harness the process. The experiments on humans were kept secret even from Spindel and his soldiers.
Mariposa Military Base was a top-secret United States military facility built to house Forced Evolutionary Virus research previously conducted at West Tek, located somewhere in the area of the Mariposa unincorporated community in California. The name "Mariposa" means "butterfly" in Spanish.
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