COSMIC TOP SECRET (CTS) is the highest level of classification within the NATO security framework. The designation applies to information whose unauthorised disclosure would cause exceptionally grave damage to NATO or to the security interests of one or more member nations. The word "COSMIC" is not an acronym but a codeword historically applied to differentiate the NATO marking from national top-secret designations. Access is strictly controlled by a need-to-know principle and is limited to individuals who hold the appropriate national-level personnel security clearance.
In the Netherlands, access to COSMIC TOP SECRET material requires an underlying Zeer Geheim VGB issued by the AIVD, combined with a NATO-specific access determination. Roles at the highest sensitivity levels within Dutch MoD structures, NATO agencies, or supporting defence contractors may carry this requirement. Candidates should expect an extended and thorough vetting process before clearance is granted.
Special access programmes within the NATO framework may introduce additional compartmented caveats beyond COSMIC TOP SECRET, each requiring a separate authorisation. Employers should consult their facility security officer or national security authority for guidance on the eligibility and process requirements applicable to specific positions.