On the eve of invasion, the Japanese garrison on Makin Atoll's main island, Butaritari, numbered 806 men: 284 naval ground troops of the 6th Special Naval Landing Force, 108 aviation personnel of the 802nd and 952nd Aviation Units, 138 troops of the 111th Pioneers, and 276 men of the Fourth Fleet Construction Department and Makin Tank Detachment of 3rd Special Base Force (3 Type 95 Ha-Go Light Tanks), all commanded by Lt.j.g. Seizo Ishikawa. The number of trained combat troops on Makin was not more than 300 soldiers.