Which supervisory measurement area focuses on training?

The focus on training within the supervisory measurement area is best aligned with leading people. This area emphasizes the importance of guiding and developing team members to ensure they possess the necessary skills and knowledge to perform their duties effectively. Training is a critical component in enhancing personnel capabilities, fostering teamwork, and building a cohesive unit.

Leaders are responsible for identifying training needs, providing opportunities for skill development, and ensuring that their team is equipped to meet operational demands. By prioritizing training, leaders not only improve individual performance but also contribute to overall mission success. This is why "leading people" is the correct choice, as it encompasses the leadership role in facilitating and nurturing a well-trained workforce.