SEAD 3 established reporting requirements for which group of personnel?

The correct answer highlights that SEAD 3 (Security Executive Agent Directive 3) established reporting requirements specifically for individuals who have access to classified information or occupy sensitive positions. This is significant because such personnel are entrusted with information that, if mishandled or if the individual is compromised, could jeopardize national security. The directive outlines the necessity for these individuals to report any potential risks or issues that may affect their loyalty, reliability, or trustworthiness, thereby maintaining the integrity of the security clearance process.

The emphasis on reporting within this group underscores the government's commitment to proactive risk management, ensuring that any change in an individual's status or behavior that could affect security is communicated appropriately. This helps mitigate the potential for insider threats or breaches of security.

In contrast, while the other options involve individuals who might be connected to security or sensitive information, they do not fall under the specific reporting requirements established by SEAD 3. Individuals without security clearances don't engage with the classified information that SEAD 3 aims to protect, and while contractors and Department of Defense personnel may have their own sets of regulations and practices, SEAD 3 specifically focuses on those with direct access to classified materials and sensitive roles.