Signals Intelligence Service organization
also: SIS
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Claims (2)
William Frederick Friedman headed
Signals Intelligence Service documented
document
“In 1921 he became chief cryptanalyst for the War Department and later led the Signals Intelligence Service (SIS)…”
source: url — William F. Friedman · p.1
Signals Intelligence Service operated_in
United States documented
document
“However military intelligence had secretly formed a Signals Intelligence Service to intercept international radio communications…”
source: government document — Church Committee Final Report, Book III: Supplementary Detailed Staff Reports on Intelligence Activities and the Rights of Americans · p.429