The FARCs, or the Fuerzas Armadas Revolucionarias de Colombia, are the revolutionary armed forces of Columbia. They are the largest left-wing rebel group in Columbia.
I think that is a difficult answer to give. Due to the many countries that exists and the variety of militar contingents in each region. Also you have to throw in the paramilitary forces and the insurgents as FARCS in colombia and Al QA eda . But there exists a site from the FBI that could give you more answers