A directory maps Imperial Japanese Navy commands and captains

The sampled succession of officers leading the Japanese shipbuilding command includes short periods when the office was vacant. The directory also lists ships, naval districts, air fleets, captains, and other command appointments. That organization lets a researcher identify who held a post at a particular date instead of searching through individual biographies. Used alongside a biographical directory and a narrative history, it reveals both the formal structure and the background of the people who operated it.