Upon completing his technical training in February 1919, Hegenberger became chief of the Instrument Branch at McCook Field, Dayton, Ohio. He was commissioned a first lieutenant, Air Service, in the Regular Army July 1, 1920, and subsequently served as assistant engineer of the Equipment Section, Air Service Engineering Division.
After completing his technical training in February 1919, Hegenberger became the head of the Instrument Branch at McCook Field in Dayton, Ohio. He was commissioned a first lieutenant in the Regular Army on July 1, 1920, and later worked as an assistant engineer for the Equipment Section within the Air Service Engineering Division.