The CPC is a space-faring organization with enough funding for numerous employees and weapons that can glass entire planets.
You are one of those employees, being sent to go remove the pathogen causing a zombie apocalypse, which just seems to be the zombies themselves. Utilizing an experimental parasite created with extremely radioactive material, hopefully it will assist your efforts. If you are unable to eradicate the pathogen, the CPC will have to glass the planet.