Commissioners are volunteer leaders who provide support, guidance, and quality control to Cub Scout packs, Boy Scout troops, and Venturing crews. They help units succeed through activities like coaching adult leaders, ensuring standards are maintained, facilitating charter renewals, and organizing roundtables. Commissioners play important roles as friends, representatives, doctors, teachers, and counselors to units. They are selected based on their people skills, Scouting knowledge, and ability to motivate and guide other commissioners. Commissioner training is required within 30 days and includes ongoing education.