What type of individual is not expected to perform full military duties?

The individual who is not expected to perform full military duties is typically a person under arrest. This status implies that the individual has been formally detained due to alleged misconduct or criminal activity, which directly impacts their duty status and responsibilities. While under arrest, the individual's capability to fulfill their military obligations is compromised both legally and operationally.

In contrast, other categories of individuals mentioned may still retain some level of responsibility or duty status. For instance, a member under investigation might still be able to carry out certain duties unless specified otherwise, depending on the nature of the investigation. A designee is usually appointed to perform specific duties as needed, and an administrative member may have limited but defined responsibilities within a support or administrative role. Therefore, the unique circumstances of being under arrest clearly delineate the individual’s inability to engage in full military duties.