Category

Defunct United States intelligence agencies

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Office of Strategic Services

United States intelligence agency (1942-1945)

WWII US special military intelligence

Counterintelligence Corps

intelligence agency within the United States Army (1941-1961)

spy ring organized by American Major (later Colonel) Benjamin Tallmadge

peacetime cryptanalytic organization of the United States

Signal Intelligence Service

codebreaking division of the United States Army during WW2