Final answer:
The Director of Naval Intelligence (DNI) is the Department of the Navy agency head responsible for establishing and maintaining an effective Personnel Security Program (PSP) to ensure access to classified information is consistent with national security interests.
Step-by-step explanation:
The Department of the Navy agency head responsible for establishing and maintaining an effective Personnel Security Program (PSP) to ensure access to classified information by each DON employee is consistent with national security interests is the Director of Naval Intelligence (DNI).
The DNI oversees and implements the PSP in accordance with Executive Order (EO) 12968, which provides guidelines for access to classified information and security clearances within the Department of Defense (DoD) and its component agencies, including the Department of the Navy.
The DNI works closely with the Defense Security Service (DSS) and other intelligence and security agencies to develop policies, procedures, and training programs to safeguard classified information and ensure national security.