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| ILLAWARRA REGIMENT | |
| IMPERIAL BUSHMEN CORPS | |
| IMPERIAL CAMEL BRIGADE | |
| IMPERIAL CAMEL CORPS | |
| 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 | |
| INFANTRY CORPS | |
| INFANTRY DIVISIONS | |
| INFANTRY OFFICERS TRAINING SCHOOL, BONEGILLA | |
| INFANTRY REGIMENTS | |
| INFANTRY TRAINING UNITS | |
| INFANTRY TROOPS WORKSHOPS | |
| INFANTRY UNITS | |
| INITIAL TRAINING SCHOOLS (RAAF) | |
| INITIAL TRAINING SCHOOL, KINGAROY | |
| INITIAL TRAINING SCHOOL, SOMERS | |
| INITIAL TRAINING SCHOOL, VICTOR HARBOUR | |
| INTELLIGENCE UNITS | |
| IRAQI FORCES | |
| ITALIAN AIR FORCE | |
| ITALIAN ARMY | |
| ITALIAN FASCIST PARTY | |
| ITALIAN NAVY | |
| ITALIAN NAVY SHIPS | |
| ITALIAN POW CAMPS | |
| ITS KINGAROY | |
| ITS SOMERS | |
| ITS VICTOR HARBOUR | |
| ITSS | |
| IWGC | |
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