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(I)
Denotes an Officer who has passed for Interpreter. (Source: Australian Navy List, 1941)
I
Intelligence
I
Iraq clasp to Australian Service Medal (ASM)
I
Islands West of Papua New Guinea, including Dutch New Guinea (RAAF)
I
Intelligence Officer (RAF)
I & R
Intelligence and Reconnaissance. At District and Province Level I & R Squads (District) and Pls (Province) were found. They were Regional Forces (RF) troops and were tasked for special missions by the District/Province Chiefs.
I & R
Issue and receipt
I CTZ
1st Corps Tactical Zone (Vietnam War)
I Lt Cr
Instructor Lieutenant Commander (Naval)
I of A
Inspector of Administration (now IDAMIN)
I of M
Inspector of Mines
I/C
In charge of
IA
Indian Army
IA
Indian Artillery
IADS
Integrated Air Defence System
IAEA
International Atomic Energy Agency
IAFD
Inland Aircraft Fuel Depot
IAFS
Indian Air Formation Signals
IAMC
Indian Army Medical Corps
IAS
Indicated air speed (USA)
IASC
Indian Army Service Corps
IBRD
International Bank for Reconstruction and Development
IC
Internment Camp
IC
Information Center (USA)
IC
Instructor Captain (Naval)
IC
Internal Combustion
ICAO
International Civil Aviation Organisation
ICAP
Integrated Civic Action Progamme. This is a co-ordinated intelligence/civic action combined United States/Government of [South] Vietnam (GVN) activity conducted in a contested or insecure area for the purpose of gathering intelligence and conducting civi
ICBM
Intercontinental ballistic missile(s)
ICC
Imperial Camel Corps (First World War)
ICC
International Control Commission for supervision of the 1954 Geneva Agreement. Represented by Canada, India, Poland
ICFY
International Conference on the Former Yugoslavia (Peacekeeping)
ICJ
International Court of Justice (United Nations Organisation - UNO)
ICKT
Integrated Circuit
ICSSEA
Integrated Communications Systems
ICT
Inflammation of connective tissues (First World War)
IDC
Graduate of the Imperial Defence College
IDC
Imperial Defence College
idc
Denotes an Officer who has completed a course at the Imperial Defence College. (Source: Australian Navy List, 1941)
IDCO
Identity Card Officer
IDD
International Direct Dial (telephone services)
IDENT
Identity
IE
Corps of Indian Engineers
IE
Initial Equipment
IEF
Indian Expeditionary Force
IEFC
International Emergency Food Council
IEME
Corps of Indian Electrical and Mechanical Engineers
IF
Instrument Flying
IFF
In Flight Following
IFF
Identification Friend or Foe (RAAF)
IFR
Instrument Flight Rules
IFS
International Financial Statistics
IFS
Inshore Fire Support Ship
IG
Inspector General (USA)
IG
Irish Guards
IGC
Inspector General of Communications (First World War)
IGC
Instructional Croup Commander
IGM
Inspector General of Munitions
IHC
International Health Certificate
IHC
International Harvester Corporation  (Vietnam)
IHIA
Include This Headquarters Information Address
II
Iran-Iraq clasp to Australian Service Medal (ASM)
IIFFV
II Field Force Vietnam
ILO
International Labour Organisation
ILO
In Lieu Of
ILS
Instrument Landing System
IMAV
Intermediate Maintenance Availability
IMB
Independent Mixed Brigade
IMCO
Inter‑Governmental Maritime Consultative Organisation
IMF
International Monetary Fund (United Nations Organisation - UNO)
IMF
International Monetary Fund
IMGU
Inspector of Machine Gun Units
IMNS
Imperial Military Nursing Service
IMP
Imperial
IMP
Improved
Imp Cam Bde
Imperial Camel Brigade
Imp Mtd DAC
Imperial Mounted Divisional Ammunition Column [First World War British Artillery Unit]
Imp Mtd Div
Imperial Mounted Division
IMS
Indian Medical Service (First World War)
IMS
Inshore Mine Sweeper Type 1
IMTFE
International Military Tribunal for the Far East
INA
Indian National Army
INCL
Includes/including
INDEP
Independent
Indep Armd Wksp S S
Independent Armoured Workshop Stores Section (Vietnam War)
Indep Recce Flt
Independent Reconnaissance Flight (Vietnam War)
India
India
Indn
Indian
Indon
Indonesia
Inf
Infantry (First World War)
INF
Intermediate-range nuclear forces
Infm
Information
Info
Information (USA)
Info sec
Information’s Security
INLR
Item No Longer Required
Innisks
The Royal Inniskilling Fusiliers
INOC
Inoculate
INOP
Inoperative
INS
Inertial Navigation System
INSEC
Internal Security
INSP
Inspect
INST
Instrument
INSTFITT
Instrument Fitter
INSTL
Install
INSTMECH
Instrument Mechanic
INSTN
Instruction
INSTR
Instructor
Int
Intelligence
Int GHQ EEF
Intelligence, General Headquarters, Egyptian Expeditionary Force [First World War British Headquarters Unit]
Int GHQ MEF
Intelligence, General Headquarters, Mediterranean Expeditionary Force [First World War British Headquarters Unit]
Int HQ 1st ANZAC Corps
Intelligence, Headquarters, 1st ANZAC Corps [First World War AIF Headquarters Unit]
Int HQ 2nd ANZAC Corps
Intelligence, Headquarters 2nd ANZAC Corps [First World War AIF Headquarters Unit]
Int HQ ANZAC
Intelligence, Headquarters Australian & New Zealand Army Corps [First World War AIF Headquarters Unit]
Int HQ Aust Corps
Intelligence, Headquarters Australian Corps [First World War AIF Headquarters Unit]
Int HQ Desert Mtd Corps
Intelligence, Headquarters Desert Mounted Corps [First World War British Headquarters Unit]
Int HQ NZ&A Div
Intelligence, Headquarters New Zealand & Australian Division [First World War AIF Headquarters Unit]
Int O
Intelligence Officer (USA)
Int Sums GHQ EEF
Intelligence Summaries, General Headquarters, Egyptian Expeditionary Force [[First World War British Headquarters Unit]
INTELO
Intelligence Officer
INTERCNT
Interconnect
INTERCOMM
Intercommunication
Interfect
International Force in East Timor
INTERFET
International Force for East Timor
Intimate Psyop
A technique used at small unit (platoon) level. Portable loudspeakers contact to surrender. Oral messages are delivered during lulls in fire and may be combined with leaflet drops.
INTMED
Intermediate
INTREP
Intelligence Report
INTRO
Introduce
INTSUM
Intelligence Summaries
INVH
Inventory Holder
IO
Intelligence Officer
IOO
Inspecting Ordnance Officer. Gathers and imparts information regarding the situation.
IOX
Inspector of Explosives
IP
Initial Points (USA)
IPC
Initial Procurement Committee
IR
Immediate Reserves
IR
International Relations
IR
Infra red
IR
Infanterie Regiment (Infantry Regiment - German, First World War)
IRBM
Intermediate-range ballistic missile(s)
IRC
International Red Cross
IRE
Instrument Rating Examiner
IRO
International Refugee Organisation
IS
Israel
ISA
Instrument Standard Atmosphere
ISB
Independent Sideband
ISIS
Inter Service Information Series, Oxford
ISLD
Indian Salvage and Local Disposal
Ismailia Int Reps GHQ MEF
Intelligence Reports, Ismailia, General Headquarters, Egyptian Expeditionary Force [First World War British Headquarters Unit]
ISO
Companion of the Imperial Service Order
ISS
Issue
ISTD
Inter Service Topographical Department, Oxford
ISTDC
Inter Service Training and Development Centre
IT
Instructional Technique
IT
Italy
ITB
Infantry Training Battalion
ITO
International Trade Organisation
ITS
Initial Training School (RAAF)
ITU
International Telecommunication Union
ITV
Independent Television News (London)
ITW
Initial Training Wing (RAF)
IWCS
Integrated Wideband Communications System
IWGC
Imperial War Graves Commission
IWT
Inland Water Transport
I‑G
Inspector General