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BACKGROUND INFORMATION

CNWDI is TOP SECRET RESTRICTED DATA or SECRET RESTRICTED DATA that reveals the theory of operation or design of the components of a thermonuclear or implosion-type fission bomb, warhead, demolition munition or test device. Specifically excluded is information concerning arming, fusing, and firing systems; limited life components; and total contained quantities of fissionable, fusionable, and high explosive materials by type. Due to the sensitivity of this information, the special requirements listed below have been established.

PERSONNEL CLEARANCE REQUIREMENTS
 * A final DSS SECRET or TOP SECRET Personnel (Security) Clearance (PCL) is required for access to CNWDI.

DISCLOSURE
 * Clearance level, CNWDI access, and “need-to-know” must be established before disclosing this information.
 * Employees must not disclose CNWDI to subcontractors or consultants without the prior written approval of the contracting activity. This approval may be included in a DD Form 254, other contract-related document, or by separate correspondence.

MARKINGS
 * In addition to other markings required by the “National Industrial Security Program Operating Manual” (NISPOM), classified material containing CNWDI must be marked:
 * “Critical Nuclear Weapons Design Information - DoD Directive 5210.2 Applies” on the cover or the first page.
 * “CNWDI” on the cover, the title page, the lead page, and the back cover of all documents.
 * “(N)” or “(CNWDI)” following the classification in each section, part, paragraph or similar portion of a classified document. For example, “TS(RD)(N)” or “TS(RD)(CNWDI)” portion markings signify that the information is TOP SECRET Restricted Data Critical Nuclear Weapons Design Information.