Operation Z was a defensive plan put into place by the Japanese during World War II to defend the Marianas Islands, and in particular, Saipan.
Fukudome and Koga in summer of 1943.
Mineichi Koga was a Japanese Marshal Admiral and commander-in-chief of the Imperial Japanese Navy's Combined Fleet.
Admiral Koga Mineichi (1942-44)
Tsuneo Matsudaira, Shigetarō Shimada, Mineichi Koga, and Saburō Hyakutake on the deck of the battleship Musashi, June 1943