The method that may be used to transmit confidential materials to DoD agencies is U.S. Postal Service (USPS) First Class Mail. The envelope or outer wrapper must be marked to indicate that the information is not to be forwarded but returned to the sender if undeliverable. Confidential information may also be transmitted by any of the means approved for transmission of Secret information, including USPS Certified Mail and other approved commercial carriers with appropriate safeguards such as signature upon delivery and package integrity. These methods ensure proper security controls while the material is in transit within the United States and its territories.
Key Points:
- Confidential materials can be sent via USPS First Class Mail but only to U.S. Government facilities, not to contractor facilities.
- The mail should be marked "Do Not Forward" and "Return to Sender" if undelivered.
- Other approved methods for Secret materials are also allowed for Confidential transmission.
- USPS Certified Mail or registered mail is used for additional security and accountability.
- Secure commercial carriers that provide constant surveillance services are also acceptable.
- Top Secret materials are not transmitted by USPS or commercial carriers under any circumstances.
This is according to the DoD directive and federal regulations for transmission of classified information to DoD agencies.