Argentine military advisors, many of them veterans of the Dirty War, trained Guatemalan security forces in interrogation techniques, counterinsurgency warfare, and political repression.

[2] Argentine involvement in Guatemala intensified in 1980, with military personnel from Argentina assisting in counterinsurgency operations, including urban assassinations carried out by the 'Secret Anti-communist Army' (ESA) during the Lucas García regime.

The notorious Batallón de Inteligencia 601 worked alongside Guatemalan death squads, employing similar tactics used in Argentina’s own repression.

Argentine advisors also trained Guatemalan personnel in Honduras, as corroborated by defectors from Battalion 3-16, a Honduran intelligence unit involved in disappearances.

However, Argentine involvement in Guatemala, along with its broader support for Central American regimes, largely ended following Argentina’s defeat in the Falklands War in 1982.