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The **405th Radio Research Detachment** was a U.S. Army signals intelligence unit active during the Vietnam War. Assigned to provide electronic intelligence, the detachment specialized in intercepting and analyzing enemy communications to support combat operations. Operating under the Army Security Agency (ASA), the 405th worked closely with ground units, often deploying in forward areas to deliver timely intelligence. Their efforts played a crucial role in disrupting Viet Cong and North Vietnamese communications, contributing significantly to U.S. military operations in Southeast Asia.