from without, section leaders are usually selected from among the members of each instrumental section (a "section" comprises all the band members who play the same musical instrument). The section leader is always an experienced band member and is usually selected by the band director (rather than elected or self-appointed) for his or her leadership skills and experience. The section leader is responsible for the minute-to-minute instruction of his or her section members, and reports to the drum majors and the band director. Many larger bands appoint more than one section leader per section, with each having a "head" section leader, whether formally or informally designated as such. College-level military bands may use the term "section sergeant" or "section officer" in place of "section leader." The director provides general guidance, selects the repertoire, interprets commentary and evaluations from judges, and auditions or recruits prospective members. What content is not provided by the director may be contracted from arrangers (who compose original works or adapt existing works) and copyists (who reproduce parts of the score), choreographers, and drill designers (primarily for field bands). With the assistance of section instructors, the director also teaches performance techniques—musical, martial, and visual—and assesses the pool of talent, choosing leaders and soloists as needed. The director also selects venues for public performance and oversees the staff that help provide funding and equipment. Many opportunities for member improvement are present: the director may organize clinics with various professionals, send representatives to specialty schools or camps, or plan trips abroad for education or exhibition. Large bands also require many support staff who can move equipment, repair instruments, and uniforms, create and manipulate props used in performances, and provide food, water, and medical assistance. Additional staff may be utilized when the band hosts functions such as competitions and reviews. In high school bands, these activities are usually performed by volunteers, typically parents of band members or the band members of the lower grades. These people are often referred to as runners or boosters. Significant support staff for college bands and independent corps are typically paid by the university or the corps organization, respectively. Performance elements The goal of each band's performance is different. Some aim for maximum uniformity and precision; others—especially scramble bands—want to be as entertaining as possible. Many U.S. university marching bands aim for maximum sound impact on the audience. Some bands perform primarily for the enjoyment