1982 Guatemalan coup d'état
The 1982 Guatemalan coup d'état was a successful military overthrow in Guatemala by junior military officers, ousting the Romeo Lucas Garcia administration and installing a three-man military junta headed by General Efraín Ríos Montt. The general ruled for a brief but bloody 17 months before being overthrown by his defense minister General Oscar Mejia Victores in another coup.
Source: Wikipedia — 1982 Guatemalan coup d'état (CC BY-SA 4.0)