Further, drug use in Vietnam was confined almost exclusively to personnel stationed at base camps and other relatively secure installations. Drug use in the field was rare and was discouraged even by personnel who used drugs in the rear. The reasoning was fairly straightforward: drug use in the field endangered lives. It was not a "victimless crime" in the field. Peer pressure was usually enough to discourage drug use when in the field. Those who were stupid enough to use drugs in the field were often beaten senseless by their non-drug-using comrades. Those that persisted were usually killed in action, sometimes by hostile fire, and occasionally, tragically, by friendly fire.