Abbreviations Used in Text and Appendixes
- Adm
- Admiral
- Addees
- Addresses
- ALNAV
- All Navy
- AirRon
- Air Squadron
- A/CNO
- Assistant Chief of Naval Operations
- BatDiv
- Battleship Division
- BB
- Battleship
- BasFor
- Base Force
- Bdcst
- Broadcast
- CA
- Heavy Cruiser
- C/A
- Cryptanalysis
- CarDiv
- Carrier Division
- Cdr
- Commander
- CINCAF
- Commander-in-Chief, Asiatic Fleet (US)
- CINCPAC
- Commander-in-Chief, Pacific Fleet (US)
- CINC2
- Commander in Chief, Second Fleet (IJN)
- CL
- Light Cruiser
- CNO
- Chief of Naval Operations, OPNAV
- Coll
- Collective
- COMINT
- Communications Intelligence
- COMSEC
- Communications Security
- COM-14
- Commandant, 14th Naval District (Hawaii)
- COM-16
- Commandant, 16th Naval District (P.I.)
- ComCarDiv
- Commander, Carrier Division
- ComUnit
- Communications Unit
- COS
- Chief of Staff
- COSCombined
- Chief of Staff, Combined Fleet
- COS2
- Chief of Staff, Second Fleet
- CruDiv
- Cruiser Division
- CV
- Fleet Carrier
- CVL
- Light Carrier
- DD
- Destroyer
- DesRon
- Destroyer Squadron
- DF
- Direction Finding
- DNC
- Director of Naval Communications (OP-20)
- DNI
- Director of Naval Intelligence (OP-16)
- DOE
- Division of Effort
- FECB
- Far East Combined Bureau
- 1stAirFltStf
- First Air Fleet Staff
- 1stSecCh
- first Section Chief
- Flt
- Fleet
- GC&CS
- Government Code and Cipher School
- GD
- Guard District
- GdDiv
- Guard Division
- Hydro
- Hydrograhic
- InfBde
- Infantry Brigade
- InfDiv
- Infantry Division
- Majcom
- Major Command
- MI
- Military Intelligence
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- MilPrep
- Military Preparations
- Msgs
- Messages
- NavalAux
- Naval Auxiliaries
- NavalSec
- Naval Section
- ND
- Naval District
- NGS
- Naval General Staff
- NTR
- Nothing to Report
- OIC
- Officer in Charge
- ONI
- Office of Naval Intelligence
- OPNAV
- Chief of Naval Operations
- ORANGE
- Japan
- OTRG
- On the Roof Gang
- PBY
- Amphibious Patrol aircraft
- P.H.
- Pearl Harbor
- RCA
- Radio Corporation of America
- R/Adm
- Rear Admiral
- Reg't Grp
- Regimental Group
- RI
- Radio Intelligence
- RIP
- Registered Intelligence Publication
- RNO
- Resident Naval Officer
- Scty
- Secretary
- SECNAV
- Secretary of the Navy
- SEF
- Southern Expeditionary Force
- 6FLT
- Sixth Fleet
- SIGINT
- Signals Intelligence
- SRH
- Special Research Histories
- SS
- Submarine
- T/A
- Traffic Analysis
- Tech Bur
- Technical Bureau
- Tfc
- Traffic
- T/I
- Traffic Intelligence
- Tokyo Comms
- Tokyo Communications Unit
- UK
- United Kingdom
- VAdm
- Vice Admiral
- Yrd
- Yard
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