Final answer:
During fire drills led by the FLS Director, all building occupants must participate to learn and practice proper evacuation procedures.
Step-by-step explanation:
When fire drills are conducted by the Fire and Life Safety (FLS) Director, everyone in the building should participate. This includes all occupants, such as students, teachers, staff, and visitors. The purpose is to ensure that everyone is aware of and can follow the proper evacuation routes and procedures in the event of an emergency. Conducting a fire drill involves not only leaving the building in an orderly and timely manner but also includes accounting for all individuals once they are out of the building, practicing using different exits, and sometimes involves the coordination with local fire departments.