Craig Dee Kunkle was a former Chief Petty Officer who specialized in antisubmarine warfare who attempted to sell classified information for $5,000 to FBI agents posing as Soviet diplomats. He was arrested in January of1989 on one count of attempted espionage. Kunkle was sentenced to 12 years in prison, fined, and also sentenced to three years probation.
(From: https://www.dhra.mil/PERSEREC/Espionage-Cases/1989/)
Security Awareness in the Nineteen Eighties