Aviation Chief Ordnanceman First Air Fleet
As a result of the studies initiated by Admiral Isoroku Yamamoto (Yamamoto, Isoruku) and taken forward by Rear Admiral Takajiro Onishi (Onishi, Takajiro) and Commander Minoru Genda (Genda, Minoru), the Japanese First Air Fleet was organized on 10 April 1941. It consisted of two divisions, each with two aircraft carriers. The First Carrier Division consisted of Akagi (flagship) and Kaga, the Second of Soryu and Hiryu and, in September, the Fifth was formed with Shokaku and Zuikaku. The First Air Fleet was commanded by Vice-Admiral Chuichi Nagumo (Nagumo, Chuichi). It sailed from Hitokappu Bay, Etorofu, in the Kuril Islands, on 26 November, i.e. 25 November in Hawaii.
You can learn more about the First Air Fleet in the following Osprey books: