Forced Evolutionary Virus
Forced Evolutionary Virus is remainder of pre-war West Tek and later U.S military research. It's a source of vile mutations of living creatures. Most known examples of beings created by FEV due to horrific experiments of the Master are Super Mutants.
History
Few years before Great War private U.S army contractor West Tek started developing Pan-Immunity Virion Project (PVP). It was supposed to make U.S military personel and civilians immune to threat of Chineese biological weapon. PVP had however flaw, or in eyes of U.S military advantage, animals exposed to virus were growing bigger and due some changes in brain were getting smarter. Military seeing great potential in PVP research moved project into Mariposa Military Base and renamed virus to Forced Evolutionary Virus. This is were West Tek involvment ends. FEV research was continued by group of scientists (following top secret orders) without knowledge of Mariposa base military personel.
