Teaching them to Kill:
Dozens of average Americans - including doctors, teachers and firefighters - take two weeks out of each year to live on a makeshift compound deep in the Ozark Mountains. The purpose? "Teaching them to kill," according to the group's founder.
Paramilitary groups, like "One Shepherd," shown here, have nearly doubled in population since 2008. While most have an anti-government ideology, One Shepherd says only that its members learn to use assault rifles, night vision and machine guns for reasons of "preparedness."