A code list that enumerates classifications of a Unites States documents. CONFIDENTIAL CONFIDENTIAL RESTRICTED FOR OFFICIAL USE ONLY NATO CONFIDENTIAL NATO CONFIDENTIAL ATOMAL NATO RESTRICTED NATO SECRET NATO SECRET ATOMAL NATO TOP SECRET NATO TOP SECRET ATOMAL SECRET SECRET RESTRICTED TOP SECRET UNCLASSIFIED UNCLASSIFIED SENSITIVE NATO UNCLASSIFIED NO CLASSIFICATION CONFIDENTIAL/NO FOREIGN SECRET/NO FOREIGN