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was woefully unprepared for such efforts.

Dennis Nolan, the AEF G-2, that two-thirds of the enemy’s divisions had been identified by intercepting and decoding Germany’s radio messages, Nolan acknowledged the U.S. The ease of intercepting radio messages quickly spurred advances in encryption and decryption of codes and ciphers. The first widespread use of radio technology for military communications occurred during World War I. While establishing early American tactical signals intelligence (SIGINT), Moorman’s RIS battled challenges of personnel, poorly informed commanders, and lapses in communication security. Frank Moorman formed the American Expeditionary Forces (AEF) Radio Intelligence Section (RIS).