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It should be remembered that SIS was not attached to the Army's intelligence organization. Military Intelligence considered cryptanalysis merely an adjunct of cryptography, which belonged in the Signal Corps. This situation continued until early in the war.
SIS began with purposes other than foreign intelligence; it was to compile systems for Army use and prepare cryptanalysts for wartime operations. Again like its counterpart, SIS produced valuable information almost as a by-product of training and was transformed into a production office for current COMINT.
SIS was renamed the Signal Security Agency in 1943, and in September 1945, became the Army Security Agency.
Sources:
William F. Friedman, A Brief History of the Signal Intelligence Service, 29 June 1942, SRH 029, CCH Files.
Anon. Centralized Control of U.S. Army Signal Intelligence Activities, SRH-276, CCH Files.
Anon., "Memorandum" re O.C.S.O Conference, 19 July 1929.
Anon., The Second Signal Service Battalion, SRH-135, CCH Files.