NATO security classifications and their significance are: (a) COSMIC TOP SECRET (CTS) - unauthorised disclosure would result in exceptionally grave damage to NATO; (b) NATO SECRET (NS) - unauthorised disclosure would result in grave damage to NATO; (c) NATO CONFIDENTIAL (NC) - unauthorised disclosure would be damaging to NATO; and (d) NATO RESTRICTED (NR) - unauthorised disclosure. would be detrimental to the interests or effectiveness of NATO.
