| | | |
| GREEK FORCES | |
| GULL FORCE | |
| GURKHA UNITS | |
| GWYDIR REGIMENT | |
H unit names | |
I unit names | |
| ILLAWARRA REGIMENT | |
| IMPERIAL BUSHMEN CORPS | |
| IMPERIAL CAMEL BRIGADE | |
| IMPERIAL CAMEL CORPS | |
| | BT CAVALRY UNITS (W1 PERIOD) | |
| | NT 1 BATTALION IMPERIAL CAMEL CORPS | |
| | NT 3 BATTALION IMPERIAL CAMEL CORPS | |
| | NT CAMEL TRANSPORT CORPS | |
| | NT IMPERIAL CAMEL BRIGADE | |
| IMPERIAL JAPANESE ARMY | |
| IMPERIAL JAPANESE NAVY | |
| IMPERIAL MOUNTED DIVISION | |
| IMPERIAL WAR GRAVES COMMISSION | |
| IMPERIAL WAR MUSEUM | |
| INDEPENDENT COMPANIES | |
| INDEPENDENT FIELD SQUADRONS | |
| INDI LIGHT HORSE | |
| INDIAN ARMY | |
| INDIAN LABOUR CORPS | |
| INDIAN MULE CORPS | |
| INDIAN NAVY | |
| INDONESIAN FORCES | |
| INFANTRY BATTALIONS | |
| INFANTRY BRIGADES | |