Japanese units on Guam Island
Prior to American assault July 21, 1944

Imperial Japanese Naval (IJN)
4th Naval Guard Force
60th Anti-Aircraft unit
755 Kokutai

Imperial Japanese Army (IJA)
29th Division (Southern Marianas Army Group) commanded by Lt. General Takashima (KIA) then Lt. General Obata
48th Independent Mixed Brigade
10th Independent Mixed Brigade
11th Mountain Army Regiment
9th Tank Regiment, 1st Company and 2nd Company
Plus many smaller units