Narcos Books

“To try to make sure gunmen do hit their targets, cartels have developed training camps. The first such camps were discovered in northeast Mexico and linked to the Zetas, but they have since been found all across the country and even over the border in Guatemala. Most are built on ranches and farmlands, such as one discovered in the community of Camargo just south of the Texas border. They are equipped with shooting ranges and makeshift assault courses and have been found storing arsenals of heavy weaponry, including boxes of grenades.
Arrested gangsters have described courses as lasting two months and involving the use of grenade launchers and .50-caliber machine guns. A training video captured by police in 2011 shows recruits running across a field, taking cover on the grass, and firing assault rifles. Sometimes training can be deadly. One recruit drowned during an exercise that required him to swim carrying his backpack and rifle. The discovery of these camps has sparked the obvious comparison to Al Qaeda training grounds in Afghanistan.
But however much schooling they give, cartels still love gunslingers with real military experience. In the first decade of democracy, up until 2010, one hundred thousand soldiers had deserted from the Mexican military. There is a startling implication: country and ghetto boys sign up for the army, get the government to pay for their training, then make real money with the mob.”
― Ioan Grillo, El Narco: Inside Mexico's Criminal Insurgency