Final answer:
The Secretary of Defense is the designated Executive Agent for the National Industrial Security Program, which is critical for overseeing how classified information is handled in private industry.
Step-by-step explanation:
The President's designated Executive Agent for the National Industrial Security Program (NISP) is the Secretary of Defense.
The NISP is a program that oversees the process by which private industry handles classified information for the United States government.
This role involves a significant level of responsibility and coordination with various agencies and sectors to ensure the protection of sensitive information critical to national security.