A graduate of the Imperial Japanese Naval Academy in 1922, Captain Ohmae served in World War II on the Staff of the 8th Fleet and of the Southeast Area Fleet (1942 and 1943), the Staff of the Mobile Fleet (1944), and was Chief, Operational Section, Imperial General Headquarters, Navy Section (1945). After the war he held a number of positions in connection with historical research on the war and was Senior Special Consultant, Military History Section.