When is a supplementary reviewer required during an NCO evaluation?

A supplementary reviewer is required during an NCO evaluation specifically when there is no Captain (CPT) or higher in the rating chain. This requirement ensures that evaluations are conducted with a level of oversight that provides fairness and accuracy. The role of a supplementary reviewer is to add an additional layer of review, ensuring that the evaluation reflects an unbiased perspective, especially in situations where the standard supervisory hierarchy may be lacking. This practice upholds the integrity of the evaluation process and ensures that all NCOs receive a fair assessment of their performance.

In contrast, the other options do not appropriately align with the established protocols for requiring a supplementary reviewer. For instance, while an NCO might request a supplementary review or be transitioning between duties, these circumstances do not automatically necessitate the involvement of a supplementary reviewer according to evaluation regulations. Similarly, yearly evaluations alone do not dictate this requirement. Thus, the correct answer highlights a specific organizational structure that is crucial for maintaining a robust evaluation system.