The Imperial Japanese Navy Aviation Bureau (海軍航空本部 , Kaigun Kōkū Hombu ) of the Ministry of the Navy of Japan was responsible for the development and training of the Imperial Japanese Navy Air Service. In 1941 it was headed by Vice-Admiral Katagiri and was organized as follows:
Vice Admiral Katagiri headed the Imperial Japanese Navy Air Service to develop and train them.
Although he was the head of the Imperial Japanese Navy Air Service, his motives aren't stated, so he might or might have not headed the service to develop and train them.