Which of the following is a requirement to join the "NUC" field program regarding citizenship?

To join the "NUC" field program, the requirement specifying that applicants must be a U.S. citizen or naturalized is crucial because it ensures that all personnel within this specialized program have a legal allegiance to the United States. This requirement is likely based on the sensitive nature of the work and the need for a clear and unambiguous commitment to the country, especially in fields involving national security, defense, and classified operations.

Having U.S. citizenship or naturalization reflects a responsibility to comply with U.S. laws and regulations, which is particularly important in military contexts. It ensures that individuals are fully integrated and committed to the values and mission of the Navy.

Other options may create complications regarding loyalty, security clearance eligibility, or the interpretation of allegiance, which are critical in military service. Thus, the requirement helps maintain the integrity and trustworthiness essential in roles related to the Navy's operations and responsibilities.