"El Flaco" ... works as a mercenary, he said, and had come to discuss a closely guarded secret of Mexico's most powerful cartels: The FGM 148 Javelin infrared-guided, missile launcher. El Flaco maintains he has been trained to perform special operations using shoulder-fired weapons, including the Javelin. He said he now trains others to use it as well. If El Flaco is telling the truth, Javelins would be among the most extreme examples of the escalation in the arms race between cartels and Mexican military. Cartels' arsenals now include belt-fed gatling guns, drone bombs and land mines. The U.S.-made Javelin is the most sophisticated shoulder-fired missile launcher in the world, with a range of a mile and a half. Its main purpose is to destroy military tanks, but it also has the capacity to take down low-flying helicopters. There are holes in the U.S. tracking system. During the Iraq War in 2003, the department lost track of 35 Javelins provided to Iraqi allied forces. ISIS was found to have a Javelin in Syria, Kurdish fighters there also obtained a Javelin and the weapon was found at a Libyan warlord base. Since 2018, the Mexican government has reported seizing a dozen rocket launchers and 56 grenade launchers from cartels. Thomas Brandon with the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives said it was clear that "criminal organizations and drug cartels based in Mexico continue to look towards the United States as a source of supply for firearms and in this case military grade weapons such as grenades, machine guns, and Man-Portable Air Defense."