cadet wing or group as designated by the detachment cadre's Commandant of Cadets (COC). In some cases, students with academic requirements that exceed four years (usually engineers and other technical majors in five-year programs) continue the AFROTC program for additional semesters as needed. During these additional years these cadets (AS700 or AS800, if on scholarship) are only minimally required to participate in LLAB and maintain retention standards. It is important to note that this is not the case for schools with co-op programs that entail a total of four years of classes and one year of cooperative experience. In these cases the cadets are classified as AS300's their first POC year and AS400's their second and third POC years. The cadets will not attend aerospace classes, Physical Training, or Leadership Lab during their co-op blocks (they will be on Periods of Non-Attendance) and otherwise complete the program like any four-year major. Cadet Wing The cadet wing (cadet group at smaller detachments) is organized to mirror the active-duty objective wing structure and is composed entirely of AFROTC cadets. Cadet rank is determined by the positions and levels of responsibility in which they hold. Cadet wings strive to include positions similar to those found in active-duty wings but additional positions may be added at the discretion of the detachment cadre's COC. Each wing is headed by a Cadet Colonel and has subsequent groups, squadrons, and flights. POC cadets rotate positions each semester and cannot hold the same position for two consecutive periods without approval. POC cadets are required to serve at least one term in a leadership position. Leadership positions include wing, group, squadron, and flight positions and others named by the CW/CC. Physical Training (PT) Cadets are required to take part in Physical Training (PT) at least twice per week each semester. Whether PT is counted as a school credit or not, attendance at PT (at least 75 percent) is required to pass Leadership Laboratory (LLAB). As a prerequisite, cadets must have a certified DoD physical or a sports physical on file at the detachment and must complete an AFROTC Physical Health Screening Questionnaire. Before the beginning of exercises, cadets receive a safety briefing on the "importance of hydration, heat stress disorders, and prompt reporting of any problems to a cadre member." Under the supervision of qualified cadre, the PT program is organized and led by AS300 and AS400 cadets. PT