What is the first line of the classification authority block?

The first line of the classification authority block is "Classified By." This line is essential as it identifies the individual or organization that is responsible for the classification of the document. It serves as an important part of the classification system, ensuring that there is clear accountability for the classification decision. Including this information helps maintain the integrity and security of classified material by clearly attributing the classification to a specific authority, which is crucial for proper oversight and declassification processes.

Understanding the structure of the classification authority block is vital for anyone handling sensitive information, as it aids in compliance with security protocols and proper document management. The subsequent lines in the block generally provide additional information such as declassification instructions or the reason for classification, but "Classified By" specifically starts the block and establishes the authority behind the classification.