| ABC |
Australian Broadcasting Commission |
| ACHQ |
Area Combined Headquarters |
| ACNB |
Australian Commonwealth Naval Board |
| ADMI |
Assistant Director of Military Intelligence |
| ADO |
Assistant District Officer |
| AFB |
Allgemeinefunkspruchbuch (German naval radio codebook) |
| AIB |
Allied Intelligence Bureau |
| AIF |
Australian Imperial Force |
| ALP |
Australian Labor Party |
| AMF |
Australian Military Forces |
| ANGAU |
Australian New Guinea Administrative Unit |
| ANZAC |
Australian and New Zealand Army Corps |
| ASIO |
Australian Security Intelligence Organisation |
| ASWG |
Australian Special Wireless Group |
| ASWS |
Australian Special Wireless Section |
| AWA |
Amalgamated Wireless Australasia Ltd |
| BSC |
British Security Co-ordination |
| BSIPDF |
British Solomon Islands Protectorate Defence Force |
| CAS |
Chief of the Air Staff |
| CAST |
Station CAST, the US Navy’s cryptanalytical unit based in the Philippines |
| CBCS |
Commonwealth Bureau of Census and Statistics |
| CCAS |
Commodore Commanding the Australian Squadron |
| CGS |
Chief of the General Staff |
| CIB |
Commonwealth Investigation Branch |
| CID |
Committee of Imperial Defence |
| C-in-C |
Commander-in-Chief |
| CINCPACFLT |
C-in-C, Pacific Fleet |
| CIU |
Communications Intelligence Unit (Melbourne) |
| CMG |
Officer of the Order of St Michael and St George |
| CNS |
Chief of Naval Staff |
| COIC |
Combined Operations and Intelligence Centre |
| COMAIRSOLS |
Commander of Air Operations Solomons |
| COMSOUPAC |
Command, South Pacific |
| COMSOUWESPACFOR |
Command, South West Pacific Forces |
| COMTASKFOR |
Command, Task Force |
| CPO |
Chief Petty Officer |
| CSS |
Captain Superintendent Sydney |
| CST |
Captain Superintendent Training |
| CTF 31 |
US Third Fleet’s unit 31 |
| DCGS |
Deputy Chief of the General Staff |
| DCNS |
Deputy Chief of Naval Staff |
| DF |
direction finding |
| DFC |
Distinguished Flying Cross |
| DMI |
Director of Military Intelligence |
| DMO&I |
Director, Military Operations and Intelligence |
| DMO&P |
Director of Military Operations and Plans |
| DNI |
Director of Naval Intelligence |
| DNO |
District Naval Officer |
| DSB |
Defence Signals Bureau |
| DSIO |
Deputy Supervising Intelligence Officer |
| DSM |
Distinguished Service Medal |
| ENIGMA |
both the German coding machine and the code it produced |
| FECB |
Far East Combined Bureau |
| FELO |
Far Eastern Liaison Office |
| FERDINAND |
codename for the ACNB’s coastwatch organisation |
| FO |
Flying Officer |
| FRUMEL |
Fleet Radio Unit Melbourne |
| FRUPAC |
Fleet Radio Unit Pacific (HYPO at Hawaii) |
| FS |
French Ship |
| GC&CS |
Government Code and Cypher School |
| GHQ |
General Headquarters |
| GOC |
General Officer Commanding |
| HDML |
harbour defence motor launch |
| HF |
high-frequency |
| HFDF |
high-frequency direction finding |
| HIJMS |
His Imperial Japanese Majesty’s Ship |
| HIRMS |
His Imperial Russian Majesty’s Ship |
| HMAS |
His Majesty’s Australian Ship |
| HNLMS |
Her Netherlands Majesty’s Ship |
| HQ |
headquarters |
| HUMINT |
human intelligence |
| HVB |
Handelsschiffsverkehrsbuch (German naval codebook) |
| HVCCO |
handle via COMINT (communications intelligence) channels only |
| IGN |
Imperial German Navy |
| IJA |
Imperial Japanese Army |
| IJN |
Imperial Japanese Navy |
| ISD |
Inter-Allied Services Department |
| IWIS |
Indian Wireless Intelligence Service |
| JIC |
Joint Intelligence Committee (UK) |
| JPC |
Joint Planning Committee |
| KANA |
Japanese Morse |
| LFDF |
low-frequency direction finding |
| LHQ |
Land Headquarters |
| LMS |
Lugger Maintenance Section |
| LWOP |
Leave without pay |
| MBE |
Member of the Order of the British Empire |
| MFDF |
medium-frequency direction finding |
| MHR |
Member of the House of Representatives |
| MLO |
Military Liaison Officer |
| NEA |
North East Area |
| NEI |
Netherlands East Indies |
| NGA |
New Guinea Area |
| NGF |
New Guinea Force |
| NID |
Naval Intelligence Division |
| NIO |
Naval Intelligence Officer |
| NSA |
National Security Agency |
| OBE |
Officer of the Order of the British Empire |
| PNIC |
Pacific Naval Intelligence Centre |
| product |
intelligence reporting derived from SIGINT |
| QMG |
Quartermaster General |
| RAAF |
Royal Australian Air Force |
| RACHMAF |
Rear Admiral Commanding, HM Australian Fleet |
| RAF |
Royal Air Force |
| RAN |
Royal Australian Navy |
| RANVR |
Royal Australian Navy Volunteer Reserve |
| RAN W/T Service |
Royal Australian Navy Wireless Telegraphy Service |
| RN |
Royal Navy |
| RNR |
Royal Navy Reserve |
| RNZN |
Royal New Zealand Navy |
| RSS |
Radio Security Service |
| sanitisation |
process used to hide true source of intelligence |
| SDA |
Special Duty Agencies |
| Security Service |
internal intelligence (UK, also known as MI5) |
| SIA |
Secret Intelligence Australia, Section B of AIB |
| SIGINT |
signals intelligence |
| SIO |
Supervising Intelligence Officer |
| SIPS |
Special Intelligence Personnel Section |
| SIS |
Secret Intelligence Service (UK, also known as MI6) |
| SKM |
Signalbuch der Kaiserlichen Marine (German Imperial Navy signal book) |
| SMS |
Seiner Majestät Schiff (His Majesty’s Ship) |
| SNDO |
Sub-District Naval Officer |
| SNO |
Senior Naval Officer |
| SO (I) |
Staff Officer (Intelligence) |
| SOA |
Special Operations Australia |
| SOE |
Special Operations Executive (UK) |
| SRD |
Services Reconnaissance Department |
| SRI |
Signal Radio Intelligence |
| SS |
steam ship |
| SWPA |
South West Pacific Area |
| SY |
steam yacht |
| TA |
traffic analysis |
| take |
raw SIGINT intercept |
| tradecraft |
techniques, processes and behaviours used in spying |
| ULTRA |
codename for the intelligence product from high-level diplomatic and strategic SIGINT derived from ENIGMA or other systems |
| USMC |
United States Marine Corps |
| USN |
United States Navy |
| USS |
United States Ship |
| USSR |
Union of Soviet Socialist Republics |
| WAC |
Women’s Auxiliary Corps (US) |
| WEC |
Wireless Experimental Centre, India |
| WRANS |
Women’s Royal Australian Naval Service |
| WRNS |
Women’s Royal Naval Service (UK) |
| W/T |
wireless telegraphy |
| WU |
Wireless Unit, RAAF |