Which of the following is NOT a type of duty for soldiers?

The correct choice, which indicates the type of duty that is NOT classified for soldiers, is based on the established categories of duties within military operations. Soldiers are expected to perform various types of duties crucial for the functionality and effectiveness of the unit.

Specified duties are those clearly outlined in regulations, orders, or directives. They detail specific tasks that a soldier must complete, leaving no ambiguity about the expectations for performance.

Directed duties are those assigned by a superior or specified in orders. They originate from leadership and provide necessary instruction for accomplishing specific mission objectives.

Implied duties refer to the tasks that are understood as necessary to effectively fulfill specified or directed duties, even if they are not explicitly stated. These duties arise from the context of the role or position a soldier holds.

Volunteered duties, however, are not an official category of duty recognized in military terms. While soldiers may volunteer for additional tasks beyond their specified, directed, or implied duties, this choice does not fall within the commonly accepted classifications of duty in military doctrine. This lack of formal recognition sets volunteered duties apart from the others listed, making it the correct answer to the question.