The National Security Agency and the EC-121 Shootdown is another addition to the NSA History and Publications Division's Special Crisis· Reports series. On 15 April 1969 a North Korean MIG-21 shot down a U.S. Navy EC-121 reconnaissance aircraft over the Sea of Japan. This is a study of the role NSA played in the crisis. It traces the origin and purposes of the flight, NSA's response to the shootdown, the aftermath investigations, and the resulting changes in the U.S. aerial reconnaissance program, warning procedures, and the development of the National Sigint Operations Center (NSOC).

Declassified and Approved for Release by NSA, CIA, DIA, the Joint Staff, NSC and OSD on 04-23-2013 pursuant to E.O 13526, MDR Case #60085