The Zetas, a group born out of deserters from an elite unit of the Mexican armed forces in the service of the Gulf Cartel, were the first to use narco tanks in the early 2010s. They went on to become one of Mexico's most powerful and feared armed groups until infighting and the loss of key leaders led to the organization's decline.
Now, the Zetas are a fragmented organization, united by little more than a name and increasingly dependent on local criminal revenues rather than the transnational flow of drugs.