Final answer:
NCOs use observations, performance appraisals, feedback, and standardized evaluations to assess the proficiency of squads, crews, and soldiers, ensuring their unit effectively fulfills its duties.
Step-by-step explanation:
NCOs, or non-commissioned officers, may assess the proficiency of their squads, crews, and individual soldiers using a variety of methods. These might include direct observations during drills and exercises, performance appraisals, and feedback from training events. Additionally, NCOs might use standardized testing or evaluations to gauge the knowledge and skills of their personnel. It is important that such assessments are conducted regularly to ensure that the unit is capable of fulfilling its duties effectively and that any areas that require improvement are identified and addressed promptly.