Military & lab work. People at risk for contracting anthrax should be immunized against it. Currently certain military personnel, people who work with anthrax in labs, people who work with imported animal hides or furs from areas of high levels of anthrax, and veterinarians working in areas (outside of usa) with high levels of anthrax.
Military. There are limited situations that require anthrax vaccination, but being in the military is one of them.