Final answer:
Classified or sensitive cargo should not be clearly labeled on the outer container to preserve security, with customs inspections done through scanning devices instead.
Step-by-step explanation:
The contents of a classified or sensitive cargo shipment should not be clearly marked on the outer container or package during shipment. The reason for this guideline is to maintain the security and confidentiality of the shipment. Revealing sensitive content labels on the exterior of shipping containers could compromise security by making the cargo a target for theft, espionage, or other security threats. For example, customs officers use tactics such as gamma ray-, x-ray-, or neutron-scanning devices to inspect cargo without the need to have contents labeled externally, ensuring secure transportation of sensitive materials. It is crucial that shipping practices comply with regulations to safeguard classified or sensitive items during transportation. Labeling of such containers is typically done in such a way that only authorized personnel can correctly identify the content, preserving the confidentiality and security of the shipment.