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- OP-20-G abstract "OP-20-G or "Office of Chief Of Naval Operations (OPNAV), 20th Division of the Office of Naval Communications, G Section / Communications Security", was the U.S. Navy's signals intelligence and cryptanalysis group during World War II. Its mission was to intercept, decrypt, and analyze naval communications from Japanese, German, and Italian navies. In addition OP-20-G also copied diplomatic messages of many foreign governments. The majority of the sections effort was directed towards Japan and included breaking the early Japanese “Blue” book fleet code. This was made possible by intercept and High Frequency Direction Finder (HFDF) sites in the Pacific, Atlantic, and continental U.S., as well as a Japanese telegraphic code school for radio operators in Washington, D.C.".
- OP-20-G activeYearsEndYear "1946".
- OP-20-G activeYearsStartYear "1922".
- OP-20-G country United_States.
- OP-20-G garrison Washington,_D.C..
- OP-20-G militaryBranch United_States_Navy.
- OP-20-G notableCommander John_R._Redman.
- OP-20-G notableCommander Joseph_Rochefort.
- OP-20-G notableCommander Laurance_Safford.
- OP-20-G role "Cryptanalysis".
- OP-20-G role "Signals intelligence".
- OP-20-G wikiPageExternalLink 457.html.
- OP-20-G wikiPageExternalLink fn1.
- OP-20-G wikiPageExternalLink pearl_harbor.htm.
- OP-20-G wikiPageID "1363367".
- OP-20-G wikiPageRevisionID "605254426".
- OP-20-G caption "Office of Chief Of Naval Operations , 20th Division of the Office of Naval Communications, G Section / Communications Security".
- OP-20-G dates "--07-01".
- OP-20-G garrison "Navy Department building, Washington, D.C.".
- OP-20-G hasPhotoCollection OP-20-G.
- OP-20-G notableCommanders "Captain John R. Redman".
- OP-20-G notableCommanders "Captain Joseph Rochefort".
- OP-20-G notableCommanders "Captain Laurance Safford".
- OP-20-G role Cryptanalysis.
- OP-20-G role Signals_intelligence.
- OP-20-G type "Code and Signal Section".
- OP-20-G unitName "OP-20-G".
- OP-20-G wordnet_type synset-unit-noun-3.
- OP-20-G subject Category:Attack_on_Pearl_Harbor.
- OP-20-G subject Category:Cryptography_organizations.
- OP-20-G subject Category:Defunct_United_States_intelligence_agencies.
- OP-20-G subject Category:Military_communications_of_the_United_States.
- OP-20-G subject Category:Signals_intelligence_of_World_War_II.
- OP-20-G subject Category:United_States_Navy_organization.
- OP-20-G type Agent.
- OP-20-G type MilitaryUnit.
- OP-20-G type Organisation.
- OP-20-G type Organization.
- OP-20-G type Troop_MilitaryUnit.
- OP-20-G type Agent.
- OP-20-G type SocialPerson.
- OP-20-G type Thing.
- OP-20-G comment "OP-20-G or "Office of Chief Of Naval Operations (OPNAV), 20th Division of the Office of Naval Communications, G Section / Communications Security", was the U.S. Navy's signals intelligence and cryptanalysis group during World War II. Its mission was to intercept, decrypt, and analyze naval communications from Japanese, German, and Italian navies. In addition OP-20-G also copied diplomatic messages of many foreign governments.".
- OP-20-G label "OP-20-G".
- OP-20-G label "OP-20-G".
- OP-20-G label "OP-20-G".
- OP-20-G sameAs OP-20-G.
- OP-20-G sameAs OP-20-G.
- OP-20-G sameAs m.04wvdm.
- OP-20-G sameAs Q224375.
- OP-20-G sameAs Q224375.
- OP-20-G wasDerivedFrom OP-20-G?oldid=605254426.
- OP-20-G isPrimaryTopicOf OP-20-G.
- OP-20-G name "OP-20-G".