Revolución del Parque, taking the weapons off the guards to add to the column of the revolutionaries. Arrested and later given amnesty, he graduated with the rank of ensign. Without abandoning his military career, he studied engineering at the University of Buenos Aires. In 1895 he was promoted to second lieutenant. In 1897 he became first lieutenant. In 1902 he became a captain. Having attained a civil engineering degree at the University of Buenos Aires, a governmental decree validated his title as a military engineer in 1904. He was appointed as teacher at the Escuela de Aplicación para Oficiales. With his promotion to the rank of major two years later he was proposed for the school of mathematics at the Military Academy and for the studies of telemetry and semaphores at the Escuela Nacional de Tiro (National Gunnery School), which would be granted in 1907. The following year, he received the nomination as executive officer in the Batallón de Ferrocarrileros, at the same time in which they were promoting him to be subdirector at the gunnery school. With the rank of Lieutenant Colonel he completed diplomatic actions, becoming military attaché to the Argentina's envoy at the centennial festivities in Chile in 1910. His return to Argentina was to Córdoba, as commander of the Fourth Artillery Brigade. Beginning of political career In 1915, during the term of office of Victorino de la Plaza, he was appointed director of the Military College, a post where he would remain for the following seven years. The great influence of this position helped him to weave contacts in political circles, just as in the military. Pursuant to the radical anti-personalist political branch (those that opposed the party leadership of Hipólito Yrigoyen), he established good relations with Marcelo T. de Alvear. During his tenure he enlarged the curriculum of the college and promoted the formation of the faculty. During Alvear's administration in 1922 he left the Military College to become the Minister of War. Promoted to the rank of brigadier general on 25 August 1923, Justo requested an increase of the defense budget to get equipment and improve the Army infrastructure. He also fomented the reorganization of the armed forces structure. At the end of 1924 he was sent as plenipotentiary to Peru, where they were celebrating the centennial of the Battle of Ayacucho. During the next few years he temporarily was the Minister of Agriculture