How is the degree of damage expected from unauthorized disclosure of Top Secret information classified?

The classification of damage from an unauthorized disclosure of Top Secret information is described as "exceptionally grave" because it pertains to the highest level of classified material. This designation reflects the potential for catastrophic consequences that could arise from such disclosures. Top Secret information is deemed to pertain to national security in a way that, if released, could lead to significant harm to the United States or its interests. This could include compromised military operations, endangerment of lives, or damage to international relations.

In the context of classifications, the terms Minor, Moderate, and Severe typically refer to lower levels of classified information, such as Confidential or Secret, but do not capture the full extent of potential repercussions that could arise from Top Secret information being revealed. Therefore, "exceptionally grave" is the appropriate classification to convey the serious and far-reaching implications of exposing such sensitive information.