Japanese Kasumigaura Naval Air Station in 1937

This station included adjacent auxiliary fields located at Tomobe and Yatabe. It was established around 1920 but not fully operating until 1925. It was the primary training school for pilots and observers. There were 7.5 squadrons stationed with training and composite landbased and seaplanes.

Source

National Archives USA. Record Group 38: Records of the Office of the Chief of Naval Operations.Series: Secret Naval Attaches Reports. Report of the Naval Attache Tokyo dated 6 August 1937 No. 219 dealing with the Expansion Program of the Naval Aviation Shore Establishment. M975-002.