What must SCI couriers possess in addition to being appointed?

The requirement for SCI couriers to possess a signed letter of authorization is critical because this document formally designates an individual as an authorized courier of Sensitive Compartmented Information. It serves as proof that the individual has been officially appointed to handle and transport such sensitive materials, ensuring that they have met the necessary training and clearance requirements. This letter is essential for accountability and for establishing trust in the security measures surrounding the transportation of SCI.

While other options such as a detailed travel itinerary, a security clearance, or a recommendation letter may contribute to the overall security framework, they do not uniquely fulfill the requirement to clearly designate someone as an authorized courier for SCI. The signed letter of authorization is a specific and necessary component of the operational protocol for handling sensitive information securely.