What are regular duties that support nuclear weapons operations known as?

The correct answer refers to the designation "Controlled PRP" which stands for Personnel Reliability Program. This program is essential in maintaining the integrity and safety of nuclear weapons operations. Regular duties that support these operations require a specific level of trust and reliability from personnel, hence the term "controlled."

Individuals involved in these duties are subjected to strict guidelines and oversight to ensure they are mentally and physically capable of handling the responsibilities that involve nuclear weapons. The Controlled PRP process includes evaluation procedures, continuous monitoring, and ensuring that personnel meet stringent security and psychological criteria.

The other choices relate to different aspects of operations but do not specifically address the personnel side that supports nuclear weapons duties. Personnel Restrictions involve general limitations on access and duties, Hazard Classes categorize the dangers associated with various munitions, and Reusability Standards refer to guidelines concerning the reuse of munitions rather than personnel roles. Thus, Controlled PRP is the most accurate term to describe the duties related to personnel reliability within nuclear weapons operations.