TIL that the Mexican government sent around 500 of it's elite soldiers to be trained as commandos at Ft. Bragg(USA), in order to better combat the rising drug violence in the country. After training, many of the soldiers returned to Mexico, only to start the brutally violent drug cartel: Los Zetas.

https://www.aljazeera.com/indepth/features/2010/10/20101019212440609775.html