A graduate of the Army Academy (
Colegio Militar de la Nación, class of 1938), he served in different Cavalry units before becoming commander of the
Regimiento de Granaderos a Caballo (Regiment of Horse Grenadiers, presidential escort unit). In 1951, he was sentenced to life imprisonment for his part in an attempted coup against
Juan Perón. He was released in 1955 with the
Revolución Libertadora, a military uprising which ousted Perón and set up a military dictatorship which was in power from 1955 to 1958. In 1956, he was designated Ambassador to the
Holy See. In 1960, he became assistant director of the Superior Military School and later Commander of the First Armored Cavalry Division. In 1962, he took part in the overthrowing of president
Arturo Frondizi, and, in 1966, supported General
Juan Carlos Onganía in the ousting of president
Arturo Illia, a decision which he later regretted. In 1968, he became
Commander-in-Chief of the Argentine Army. ==Presidency==