Promoted to lieutenant commander in 1922, four years later Toscano was appointed teacher of Naval Art and History at the Accademia Aeronautica in Caserta. In November 1926 he was promoted to commander. Later assigned to the Naval Warfare Institute in Livorno, between 1937 and 1939 he became its course director, first as a captain and later as a rear admiral. In July 1939, Toscano became General Personnel Manager.
