About this Unit
The 6921st Radio Group, Mobile (RGM), was a United States Air Force Security Service (USAFSS) signals intelligence unit, activated in 1950 during the Korean War. Stationed primarily at Misawa Air Base, Japan, the unit was responsible for intercepting, analyzing, and reporting on enemy communications, providing critical intelligence support to United Nations and U.S. forces in the region. The 6921st RGM played a vital role in Cold War intelligence-gathering throughout the 1950s and 1960s, adapting to emerging technologies and evolving threats. In 1979, the unit was redesignated as the 6921st Electronic Security Group, reflecting its expanded mission and capabilities within the Air Force's intelligence network.
Historical Facts
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Origins: The 6921st Radio Group, Mobile (RGM) was activated in June 1950 under the United States Air Force Security Service (USAFSS), specializing in signals intelligence (SIGINT) and electronic surveillance.
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Location: The unit was primarily based at Misawa Air Base, Japan, playing a strategic role in monitoring Soviet and Chinese communications during the Cold War.
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Korean War Role: The 6921st RGM was rapidly deployed in response to the outbreak of the Korean War, supporting United Nations Command with vital intelligence on enemy communications and troop movements.
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Mobile Operations: Despite its "Radio Group, Mobile" designation, the unit operated both fixed and mobile intercept sites across the Pacific theater, including deployments to Korea and other key locations in Asia.
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Cryptologic Achievements: The unit excelled in intercepting and decrypting enemy transmissions, contributing to the broader efforts of the USAFSS and National Security Agency (NSA).
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Expansion and Reorganization: Over time, the 6921st RGM expanded in size and mission scope, eventually becoming part of the 6920th Security Wing in the late 1950s, reflecting the growing importance of electronic intelligence.
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International Cooperation: The group worked closely with allied intelligence organizations, including the British and Australian signals intelligence communities, fostering international partnerships during the Cold War.
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Notable Personnel: Many veterans of the 6921st RGM went on to significant careers in U.S. intelligence agencies, with several being recognized for their achievements in cryptologic history.
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Legacy at Misawa: The 6921st RGM’s presence at Misawa helped establish the base as a major intelligence hub in the Pacific, a legacy that continues with successor units like the 373rd Intelligence, Surveillance and Reconnaissance Group.
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Commemoration: Alumni of the 6921st RGM maintain active reunion groups and online communities, preserving the stories and history of the unit’s contributions to U.S. and allied security during critical moments in the Cold War.
