DN2 : Preparation of the military forces to protect the internal security of the country . This would include police actions against guerrilla forces , counter-drug operations , and , originally , political control . Up to 1970 , the Mexican Army had been used as a repressive force to maintain the virtual ruling party PRI government . The most controversial use of the military had been called " The dirty war " in the 1960s , which included the 1968 Tlatelolco massacre of students and unsuspecting bystanders . After 1980 these types of operations had nearly completely ceased ( see EZLN )
Tlatelolco massacre
Tlatelolco massacre
Mexican Armed Forces