6988th Security Squadron

• Origins in the Korean War: The 6988th Security Squadron was activated in 1951 at Yokota Air Base, Japan, primarily to support signals intelligence (SIGINT) operations during the Korean War. • Role in Signals Intelligence: The unit was part of the United States Air Force Security Service (USAFSS) and specialized in intercepting and analyzing enemy communications. • RC-135 Reconnaissance Missions: The squadron was known for operating RC-135 aircraft, which conducted airborne intelligence-gathering missions over East Asia. • Participation in the EC-121 Shootdown Incident: Members of the 6988th were aboard the EC-121M reconnaissance plane shot down by North Korea on April 15, 1969, resulting in the loss of 31 American lives. • Cold War Frontline Duties: Stationed at Yokota AB, the unit was at the forefront of Cold War intelligence activities, monitoring Soviet, Chinese, and North Korean military communications. • Highly Decorated Unit: The 6988th received several commendations for its contributions to U.S. and allied security during periods of heightened tensions in the Pacific. • Support to Vietnam War Efforts: The squadron provided vital intelligence to support air and ground operations in Southeast Asia, especially during the Vietnam War. • Technological Pioneers: The unit incorporated new technologies for signals interception, helping to advance the state of airborne SIGINT operations. • Deactivation and Legacy: The 6988th was deactivated in 1971, but many of its missions and personnel continued under successor intelligence units. • Commemoration and Memorials: The sacrifices and service of the 6988th, particularly those lost in the 1969 EC-121 shootdown, are remembered at memorials such as the National Security Agency’s Cryptologic Memorial Wall.