Comsec Incident definition in Computer Security terms:
Definition(s): Any occurrence that potentially jeopardizes the security of COMSEC material or the secure transmission of national security information. COMSEC Incident includes Cryptographic Incident, Personnel Incident, Physical Incident, and Protective Technology/Package Incident.
Source(s): CNSSI 4009-2015 (CNSSI 4005, NSA/CSS Manual Number 3-16 (COMSEC))
reference: CSRC Glossary