21,060 total men under arms
Lieut. General Tadamichi Kuribayashi, commanding
Colonel Tadashi Takaishi, chief of staff
Army
109th Division
145th Infantry Regiment
17th Mixed Infantry Regiment
26th Tank Regiment
2nd Mixed Brigade
Navy
125th Anti-Aircraft Defense Unit
132nd Anti-Aircraft Defense Unit
141st Anti-Aircraft Defense Unit
149th Anti-Aircraft Defense Unit