General guidance for the Appendix D (Classified Appendix) includes:

When Does a CDD Need a Classified Appendix?

- When only a small subset of the CDD needs to be protected at a higher classification level.

- If the document is not useful without this appendix, the document is to be classified at a higher level.
- A classified appendix's content counts toward the document body page limits and must be indexed to align with the baseline document sections.
- Except where the existence of classified content cannot be acknowledged, each section of the baseline document augmented by the classified appendix must refer the reader to the classified appendix.
- If used, the appendix will be provided to the Joint Staff Gatekeeper or J-8/SAPCOORD IAW its classification level.