In the cadet class of the second which Nishikubo had been belonging to, there were also General Hisaichi SUGANO who served as commander of the Taiwan army (Japanese Army), General Morishige MORIOKA who served as commander of the Korean army (Japanese Army), General Takao SUZUKI who served as chief of the technical office of the army and so on.
士官候補生第2期である西久保の同期には台湾軍(日本軍)司令官菅野尚一陸軍大将・朝鮮軍(日本軍)司令官森岡守成大将・陸軍技術本部長鈴木孝雄大将らがいる。