What action is required when an employee no longer needs access to classified information?

When an employee no longer requires access to classified information, it is essential to terminate their clearance in the Defense Information System for Security (DISS). This action is pivotal for maintaining the integrity and security of classified information. By promptly terminating the individual's clearance, the organization ensures that sensitive information is only accessible to those who need it for their duties, thus minimizing the risk of unauthorized access.

This process not only safeguards the classified data but also ensures compliance with regulations concerning access management and personnel security. It is a crucial step in risk management, as retaining access rights for individuals who no longer need them can lead to potential security breaches.

Other options, such as simply notifying Human Resources or updating access permissions, do not adequately address the need for the clearance to be formally revoked in DISS, which is the proper protocol for handling such situations. Not taking action or thinking that no action is necessary could also lead to significant security vulnerabilities.