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After his promotion to lieutenant on 1 December 1919, he was assigned to the Tenryū, served a year as communications officer on Chichijima in the Ogasawara Islands, and returned to serve as communications officer on Mutsu, and seaplane tender Wakamiya.
The large exhibit room on the first floor contains a Yokosuka D4Y bomber aircraft and Type 97 Chi-Ha recovered from Yap Island, along with a Kaiten-type torpedo and replicas of an Ohka Model 11 aircraft and Mutsu battleship.