Coming from a Catholic family, Emilio Massera was born in Paraná, Entre Ríos, to Paula Padula and Emilio Massera, grandson of immigrants from Switzerland. Massera entered Argentina's Naval Military School in 1942, obtaining his commission as a midshipman in 1946. After the "Revolución Libertadora" in 1955, Massera entered the Naval Information Service. During his career he occupied different positions within the Navy, including command of the sail training ship ARA "Libertad" and command of the Sea Fleet in 1973. In 1974 Massera was promoted to the rank of full Admiral and became the Commander-in-Chief of the Argentine Navy, after the government sent a number of senior admirals into forced retirement.