No reason is given, but some theorize it is to help contain the spread of the pandemic. It's not long, however, that they receive orders from the top to kill everyone they come across, living or dead. Huck remembers first firing on the empties and using her thermal vision goggles to decipher friend from foe. Her unit receives orders to track down any civilians and bring them safely back to their temporary base for protection. Huck was in a bar, drinking and playing blindfolded darts with others in her unit -including a romantic interest - when a breaking news update took over the television to report on a viral outbreak at a nearby hospital.