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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 "0001".
OP-20-G activeYearsStartYear "0001".
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 wikiPageLength "10227".
OP-20-G wikiPageOutDegree "80".
OP-20-G wikiPageRevisionID "631890284".
OP-20-G wikiPageWikiLink Alvin_Kramer.
OP-20-G wikiPageWikiLink Andrew_Gleason.
OP-20-G wikiPageWikiLink Andrew_M._Gleason.
OP-20-G wikiPageWikiLink Atlantic_Ocean.
OP-20-G wikiPageWikiLink Australia.
OP-20-G wikiPageWikiLink Bainbridge_Island,_Washington.
OP-20-G wikiPageWikiLink Battle_of_the_Philippines_(1941-42).
OP-20-G wikiPageWikiLink Category:Attack_on_Pearl_Harbor.
OP-20-G wikiPageWikiLink Category:Cryptography_organizations.
OP-20-G wikiPageWikiLink Category:Defunct_United_States_intelligence_agencies.
OP-20-G wikiPageWikiLink Category:Military_communications_of_the_United_States.
OP-20-G wikiPageWikiLink Category:Signals_intelligence_of_World_War_II.
OP-20-G wikiPageWikiLink Category:United_States_Navy_organization.
OP-20-G wikiPageWikiLink Cipher.
OP-20-G wikiPageWikiLink Codebreakers.
OP-20-G wikiPageWikiLink Cordell_Hull.
OP-20-G wikiPageWikiLink Corregidor.
OP-20-G wikiPageWikiLink Cryptanalysis.
OP-20-G wikiPageWikiLink Diplomacy.
OP-20-G wikiPageWikiLink Empire_of_Japan.
OP-20-G wikiPageWikiLink FRUMEL.
OP-20-G wikiPageWikiLink Federal_Bureau_of_Investigation.
OP-20-G wikiPageWikiLink Federal_Communications_Commission.
OP-20-G wikiPageWikiLink Fleet_Radio_Unit.
OP-20-G wikiPageWikiLink Fort_Ward_(Washington).
OP-20-G wikiPageWikiLink George_C._Marshall.
OP-20-G wikiPageWikiLink George_Marshall.
OP-20-G wikiPageWikiLink Germany.
OP-20-G wikiPageWikiLink High-frequency_direction_finding.
OP-20-G wikiPageWikiLink Imperial_Japanese_Navy.
OP-20-G wikiPageWikiLink Italy.
OP-20-G wikiPageWikiLink Japan.
OP-20-G wikiPageWikiLink Japanese_language.
OP-20-G wikiPageWikiLink Japanese_naval_codes.
OP-20-G wikiPageWikiLink John_R._Redman.
OP-20-G wikiPageWikiLink Joseph_Rochefort.
OP-20-G wikiPageWikiLink Kana.
OP-20-G wikiPageWikiLink Laurance_F._Safford.
OP-20-G wikiPageWikiLink Laurance_Safford.
OP-20-G wikiPageWikiLink Lieutenant.
OP-20-G wikiPageWikiLink Magic_(cryptography).
OP-20-G wikiPageWikiLink Melbourne.
OP-20-G wikiPageWikiLink New_York.
OP-20-G wikiPageWikiLink OP-20-G.
OP-20-G wikiPageWikiLink Officer_(armed_forces).
OP-20-G wikiPageWikiLink Pacific.
OP-20-G wikiPageWikiLink Pacific_Ocean.
OP-20-G wikiPageWikiLink Pearl_Harbor.
OP-20-G wikiPageWikiLink Philippines.
OP-20-G wikiPageWikiLink Philippines_Campaign_(1941–42).
OP-20-G wikiPageWikiLink Photograph.
OP-20-G wikiPageWikiLink Photographs.
OP-20-G wikiPageWikiLink Purple_(cipher_machine).
OP-20-G wikiPageWikiLink Radio.
OP-20-G wikiPageWikiLink Rufus_S._Bratton.
OP-20-G wikiPageWikiLink Signals_Intelligence_Service.
OP-20-G wikiPageWikiLink Signals_intelligence.
OP-20-G wikiPageWikiLink Station_BELL.
OP-20-G wikiPageWikiLink Station_CAST.
OP-20-G wikiPageWikiLink Station_HYPO.
OP-20-G wikiPageWikiLink Station_NEGAT.
OP-20-G wikiPageWikiLink U.S._Navy.
OP-20-G wikiPageWikiLink US_Army.
OP-20-G wikiPageWikiLink US_Navy.
OP-20-G wikiPageWikiLink United_States.
OP-20-G wikiPageWikiLink United_States_Army.
OP-20-G wikiPageWikiLink United_States_Coast_Guard.
OP-20-G wikiPageWikiLink United_States_Department_of_the_Navy.
OP-20-G wikiPageWikiLink United_States_Marine_Corps.
OP-20-G wikiPageWikiLink United_States_Naval_Computing_Machine_Laboratory.
OP-20-G wikiPageWikiLink United_States_Navy.
OP-20-G wikiPageWikiLink Wabun_code.
OP-20-G wikiPageWikiLink Walter_Short.
OP-20-G wikiPageWikiLink Washington,_D.C..
OP-20-G wikiPageWikiLink World_War_II.
OP-20-G wikiPageWikiLinkText "OP-20-G".
OP-20-G wikiPageWikiLinkText "Office of Naval Communications".
OP-20-G wikiPageWikiLinkText "United States Navy Communications Intelligence Organization".
OP-20-G wikiPageWikiLinkText "signals intelligence".
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.".