This spring, the National Park Service unveiled a monument honoring the first ranger killed in the line of duty. Thirty three have died on the job in the hundred years since the agency was created, gunfire being the number one cause of death. The types of crime that happen outside park boundaries also happen inside. That’s why many park rangers are also commissioned law enforcement officers. Northern Arizona University has one of the few training programs in the country for these prospective rangers. Arizona Public Radio’s Justin Regan reports.