An official website of the United States government
Here's how you know
Official websites use .mil
A
.mil
website belongs to an official U.S. Department of Defense organization in the United States.
Secure .mil websites use HTTPS
A
lock (
lock
)
or
https://
means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.
Skip to main content (Press Enter).
Toggle navigation
DoD CUI Program
DoD CUI Program
Search
Search DODCUI:
Search
Search DODCUI:
Search
Home
About Us
About Us
Policy
Training
CMMC
Cybersecurity Maturity Model Certification
What's New
Frequently Asked Questions
CUI Registry Change Log
CUI Registry New
Component Points of Contact
Home
Training
Portion Marking
Portion Marking
Markings are for training use only.
Portion markings apply to the information immediately following the portion mark.
Portion marking is mandatory on documents:
- Sent outside of DoD.
- Sent to the Defense Industrial Base.
- Signed by DoD senior leadership.
In all other instances, portion marking requirements will be determined by the Component Senior Agency Official.
If any portions are marked, then all portions will be marked. Portions include subjects, titles, paragraphs and sub-paragraphs, bullet points and sub-bullet points, headings, pictures, graphs, charts, maps, and reference lists. Don’t apply portion markings to the CUI designation indicator block.
When portion marking, mark all portions containing CUI with “(CUI).” Mark portions with unclassified information with “(U).”
Portion marking is not required for sub-paragraphs or sub-bullet points if they carry the same control markings as the main paragraph or bullet point, but marking of all portions is required if any sub-paragraph or sub-bullet point has a control marking that is different from the main paragraph or bullet point.