6921ST Radio Group, Mobile (USAFSS)

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.