Spyromilios was born in Himara, southern Albania (a region that Greeks refer to as Northern Epirus). He became an officer in the Hellenic Navy and participated in the Greco-Italian War (1940-1941). During his service he was positioned in the Northern Epirus Naval Command. In December 1940, he participated in the military operations that led to the capture of his home town by the Greek military. In another occasion, on March 1, 1941, in charge of a small patrol boat he repelled an attack by an Italian submarine that approached the shores of Himara, in the Panormos sector.