What level of classification must be transferred only by an official US Government courier or designated employee?

The requirement for transferring classified information through official means is primarily associated with the level of classification. Top Secret information is the highest classification level in the U.S. security classification system. This level encompasses information that, if disclosed, could cause exceptionally grave damage to national security.

Therefore, it is imperative that Top Secret materials are handled with the strictest protocols to ensure their security and integrity during transport. Official U.S. Government couriers or designated employees are specifically authorized to transfer this sensitive material to mitigate the risk of unauthorized access or disclosure.

In contrast, other classification levels—Confidential, Secret, and Restricted—do not have the same stringent transport requirements. They can often be handled through less formal channels as long as they adhere to established safety procedures appropriate to their classification level. This distinction underscores the importance of safeguarding Top Secret information, maintaining a secure and regulated protocol for its transfer to protect national security interests.