From 1950 to 1952 CostaeSilva was a military attaché in Argentina.
Released from command in 1962 for harsh suppression of student manifestations, CostaeSilva was one of the leaders of the military coup of 1964 ousting President João Goulart.
In 1969 CostaeSilva conceded to a moderate liberalization of the military regime, but on 28 Aug 1969 he shown first signs of cerebral thrombosis and was transferred from Brasília to Rio de Janeiro, where he was hospitalized.