Most of South America's Militaries are geared toward Counter Insurgency Operations. Be it groups like MRTA, Sendero Luminoso, FARC. Tupac Amaru what have you. Most now have ties to Narcotics Trafficing since the Cuban by way of the USSR money has dried up.
Peru, Colombia, Ecuador, and Boliva all have very good Special Forces type units to deal with these threats. Most of their Officers have recieved some training from the US or other Countries.
The National Police of many countries in South America is a more Para-Military unit than Police Dept's in the US. That have strong special op's units and even expeditionary (within the country) capabilities.