What role does an OCA play concerning the basis for compiling classification?

The role of an Original Classification Authority (OCA) is primarily centered around making decisions on the classification of information and providing guidance on how to compile classified materials appropriately. An OCA is responsible for determining the level of classification that certain information requires based on established criteria, including whether the information could reasonably be expected to cause harm to national security if disclosed.

The OCA ensures that classification practices are consistent and adhere to relevant policies and regulations, offering expertise on what constitutes classified information and how it should be marked and handled. This guidance is crucial for anyone involved in the classification process, as it helps maintain the integrity of national security by preventing unauthorized access to sensitive information.

In contrast, other options represent duties that are not primarily the role of an OCA. The review and update of existing information, the provision of services related to national security, and the monitoring of publicly released information involve different responsibilities that may fall under other authorities or departments within an organization.