Which restriction applies to submitting investigations for national security eligibility?

The restriction regarding submitting investigations for national security eligibility specifically pertains to non-U.S. citizens. National security clearances are primarily intended for U.S. citizens because they must satisfy specific legal and regulatory criteria that emphasize loyalty to the United States and protect national interests. Non-U.S. citizens may pose a potential risk in terms of allegiance, which is a key consideration when determining eligibility for sensitive positions within the government or military.

U.S. citizenship is a fundamental requirement for access to classified information or national security work because it establishes a level of trust and accountability expected from individuals who might have access to sensitive data. As such, non-U.S. citizens are not eligible for these investigations, which makes them constrained from qualifying for a national security clearance. This ensures that only those who have a definitive legal and personal connection to the U.S. are considered for positions that could significantly impact national security.

The other options either do not directly relate to the eligibility for investigations or contain categories that do not have the same restrictions under national security clearance processes.