Office of the Chief Signal Officer organization
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William Friedman headed
Office of the Chief Signal Officer documented
document
“In 1921 Friedman and his wife also a skilled cryptologist entered into a six-month contract with the Signal Corps and continued the relationship as civil servants on the War Department payroll until 1922 when he became Chief Cryptanalyst an…”
source: government document — Church Committee Final Report, Book VI: Supplementary Reports on Intelligence Activities · p.132