* North Korean International Documentation Project (NKIDP)* Photo of the EC-121M 135749 (PR-21)* April 2001 OpEd on VQ-1 EP-3E (PR-32) Chinese force down and seizure compared to April 1969 VQ-1 EC-121 (PR-21) North Korean shoot down.
==External links==* North Korean International Documentation Project (NKIDP)* Photo of the EC-121M 135749 (PR-21)* April 2001 OpEd on VQ-1 EP-3E (PR-32) Chinese force down and seizure compared to April 1969 VQ-1 EC-121 (PR-21) North Korean shoot down.