What are the mandatory types of NCOERs?

The correct answer encompasses all the specified types of Noncommissioned Officer Evaluation Reports (NCOERs) because these reports serve crucial roles in evaluating NCO performance and fulfillment of their duties.

The Change of Rater NCOER is mandatory when an NCO's immediate supervisor changes. This helps ensure that evaluations reflect the most current and relevant supervision period, allowing the new rater to provide an accurate assessment based on their direct observations and interactions.

An Extended Annual NCOER is required when an NCO has served under the same rater for a prolonged period, typically exceeding the standard rating period. This type of evaluation ensures that NCOs receive formal assessments even when they remain under the same rater, thereby facilitating ongoing professional development and performance reviews.

The Change of Duty NCOER is necessary whenever an NCO has a permanent change of duty assignment, which can reflect major transitions in their career trajectory. This report provides an assessment of the NCO’s effectiveness in new roles and responsibilities.

By including all these types of evaluations as mandatory, the evaluation system ensures thorough, fair, and accurate assessments of NCO performance, maintaining high standards of accountability within the Army's leadership framework.