The Zetas are one of the most disruptive and aggressive of them all. Formed by ex-military men who became armed enforcers for the Gulf Cartel, the Zetas split with their former patrons nearly three years ago and have since become one of Mexico's largest and most dangerous cartels. While most of those ex-military founding fathers of the cartel are now dead or in prison, they've retained a culture of military loyalties, if not so much the discipline and hierarchy. Or much in the way of taste. In September, Mexican police arrested Ramiro Pozos, the alleged leader of drug gang "The Resistance" and Zeta ally -- with his gold- and silver-plated AK-47.