Revision as of 02:53, 15 January 2026

Optional modification

National Security Agency (NSA)-approved modification not required for universal implementation by all holders of a COMSEC end-item. This class of modification requires all of the engineering/doctrinal control of mandatory modification but is usually not related to security, safety, TEMPEST, or reliability. See mandatory modification (MAN).

Source: CNSSI 4009-2015 | Category:

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