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American Signal Intelligence in Northwest Africa and Western Europe by George F. Howe

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Appendix A. Agreement between the War Department and G.C.&C.S.

May 17, 1943

Agreement between British Government Code and Cipher School and U.S. War Department concerning cooperation in matters relating to:

U.S.

British

Special Intelligence A

Special Intelligence

Special Intelligence B

Y Intelligence

T A Intelligence

Y Inference

A distinction is made in nomenclature and procedure in handling intelligence derived from the solution of enemy high grade and that obtained from low grade codes and ciphers. The preservation of secrecy in regard to either category is a matter of great concern to both countries and if the highest degree of security is to be maintained, it is essential that the same methods should be pursued by both countries at every level and in ...

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