Jordan Fisher Smith. If you had to guess which federal agents in the U.S. face the greater danger, who would you put your money on: the officers who wage the endless War on Drugs, or the rangers who patrol the green acres of the national parks? Well, it's the rangers. According to a 2001 study by the Bureau of Justice, nature's security guards are twice as likely to be assaulted on the job as agents with the Drug Enforcement Administration. Being a ranger entails more risk than you might imagine. Routine maintenance and rescues can require skiing in avalanche-prone terrain, …