UKUSA Agreement Release


Please Note: These historical documents are PDF images of formerly classified carbon paper and reports that have been declassified. Due to the age and poor quality of some of the PDF images, a screen reader may not be able to process the images into word documents. In accordance with Section 504 of the Rehabilitation Act of 1973, as amended, individuals may request that the government provide auxiliary aids or services to ensure effective communication of the substance of the documents. For such requests, please contact the Freedom of Information Act Office at or Public Affairs Office at 443-634-0721.

The tradition of intelligence sharing between NSA and its Second party partners has deep and widespread roots that have been cultivated for almost three quarters of a century. During World War II, the U.S. Army and Navy each developed independent foreign SIGINT relationships with the British and the Dominions of Canada, Australia, and New Zealand. These relations evolved and continued across the decades. The bonds, forged in the heat of a world war and tempered by decades of trust and teamwork, remain essential to future intelligence successes.

The March 5, 1946, signing of the BRUSA (now known as UKUSA) Agreement marked the reaffirmation of the vital WWII cooperation between the United Kingdom and United States. Over the next 10 years, appendices to the Agreement, some of which are included with this release to the public, were drafted and revised. These appendices and their annexures provide details of the working relationship between the two partners and also address arrangements with the other Second Parties (Australia, Canada, and New Zealand).


 SPEC_INT_10JUN43.PDFAgreement between British Government Code and Cipher School and U.S. War Department in Regard to Certain "Special Intelligence" - 10 June 1943
 GC-CS-NEGAT_23OCT44.PDFAn Agreement between GC & CS and Negat on Japanese Cryptanalytic Tasks - 23 Oct. 1944
 COMMS_INT_23JUN43.PDFAn Agreement between the U.S. Army and British CG and CS Concerning Cooperation in Matters Relating to Communication Intelligence - 23 June 1943
 APPENDICES_A-G_26FEB46.PDFAppendices A-G to British-U.S. CI Agreement British - U.S. Communications Intelligence Security and Dissemination Regulations - 26 Feb. 1946
 APPENDICES_JUL48.PDFAppendices to U.S.-British Communications Agreement - 15-26 July 1948
 APPENDIX_CI_AGREE_NOTDATED.PDFAppendix to British-U.S. CI Agreement - Regulations for the Coordination of the Exchange of Collateral Material - Not dated
 APPENDIX_CI_AGREE_5FEB46.PDFAppendix to British-U.S. CI Agreement Regulations for the Coordination of Cryptanalysis Traffic Analysis and Associated Techniques - 5 Feb. 1946
 APPENDIX_BRUSA_CI_22JANN46.PDFAppendix to BRUSA CI Agreement: British-U.S. COMINT Security and Dissemination Regulations - 22 Jan. 1946
 GERMAN_JAPANESE_PROJ_4JUL44.PDFBritish-U.S. Agreement on German and Japanese Projects - 4 July 1944
 AGREEMENT_OUTLINE_5MAR46.PDFBritish-U.S. Communications Intelligence Agreement and Outline - 5 March 1946
 SECURITY_DISS_REGS_30JAN46.PDFBritish-U.S. Communications Intelligence Security and Dissemination Regulations - 30 Jan. 1946
 BRUSA_FINAL_REP_1953.PDFBRUSA Planning Conference Final Report
 BRUSA_TRAFFIC_23JUN44.PDFBRUSA Traffic - 23 June 1944
 CLASSIFICATION_AND_HANDLING_OF_INFORMATION_RELATED_TO_COMINT_OR_COMINT_ACTIVITIES_APPENDIX_B_ANNEXURE_B3_5_OCTOBER_1959.PDFClassification and Handling of Information Related to COMINT or COMINT Related Activities; Appendix B; Annexure B3 5 October 1959
 COMMS_INT_8FEB46.PDFCommunications Intelligence - 8 Feb. 1946
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