Nine non-nuclear commercial industries which engage in high-value or high-risk operations were interviewed. Current security periodicals and books were also reviewed to determine whether there are any unique security practices, techniques, or procedures in use by non-nuclear commercial industries that may benefit the security posture of the NRC and it licensees. The study briefly reviews ten specific types of threat posed by the external adversary; basic reasons for adversarial success; and detection and prevention strategies. The 'average' level of security, as evidenced in practice, and the most stringent level of security used by the interviewees are also examined. (NTIS abstract)