The DA Form 2166-9-1 is an essential tool for evaluating the performance of Non-Commissioned Officers (NCOs) in the U.S. Army, specifically for the rank of Sergeant. This form serves multiple purposes, including documenting the NCO's administrative data, performance evaluation, and potential assessment. It is structured to capture vital information such as the NCO's name, Social Security Number, rank, and the period covered by the evaluation. Additionally, the form requires input from various rating officials, including the rater and senior rater, who provide their signatures and feedback on the NCO's performance. The evaluation focuses on several key areas, including character, presence, intellect, leadership, development, and achievement. Each section allows for specific comments, ensuring a comprehensive review of the NCO's contributions and areas for improvement. Furthermore, the form includes a section for counseling dates, which emphasizes the importance of ongoing communication between the NCO and their leaders. Understanding the nuances of this form is crucial for both evaluators and those being evaluated, as it plays a significant role in career progression and professional development within the Army.