What classification concept was used to determine the derivative classification for the new document about the training exercise taking place in Seattle?

The classification concept of "Contained in" is used in derivative classification as it pertains to how classified information is incorporated within a new document. This concept requires that an individual assess whether the new document includes information that is directly pulled from or clearly derived from existing classified sources. In the case of the training exercise document about Seattle, if the new content includes specific details that are classified and were part of an original classified document, then "Contained in" is the appropriate classification principle.

This classification method emphasizes understanding that when creating new documents, the information being added must comply with the original classification of the sources it is derived from. The training exercise may include sensitive details about operations, locations, or personnel that reflect the original classified materials, necessitating the use of this classification concept to ensure compliance with security protocols and proper handling of sensitive information.