Which of the following describes a 'Secret' classification?

The classification 'Secret' is defined as information that, if disclosed, could cause serious damage to national security. This categorization is part of a broader classification system that includes different levels of sensitivity, with 'Secret' falling in the middle. This means that while such information does not reach the highest threshold of 'Top Secret', the potential harm it could bring to national security is significant enough to warrant protective measures and restricted access. Understanding this classification is crucial for personnel security, as it informs how sensitive information is handled and shared within governmental and military contexts. Recognizing the implications associated with handling 'Secret' classified information is essential for safeguarding national interests and maintaining operational security.