Paul Rexton Kan is currently an Associate Professor of National Security Studies and the Henry L. Stimson Chair of Military Studies at the US Army War College. He is also the author of the book Drugs and Contemporary Warfare (Potomac Books, 2009). He recently completed field research along the US-Mexico border for his forthcoming book, Cartels at War: Mexico's Drug Fueled Violence and the Threat to US National Security (Potomac Books).