Final answer:
The Planning Section Chief typically conducts the Operational Period Briefing in emergency incidents and planned events as part of the Incident Command System.
Step-by-step explanation:
The individual who generally facilitates the Operational Period Briefing is the B. Planning Section Chief. This briefing is a critical component of the Incident Command System (ICS), which is used to manage emergency incidents and planned events. The Planning Section Chief, as part of the incident management team, is responsible for the collection, evaluation, dissemination, and use of information regarding the development of the incident, and for the preparation and documentation of the Incident Action Plan (IAP). This includes facilitating the Operational Period Briefing, which communicates the objectives, strategies, and tactics for the upcoming operational period to personnel involved in the incident.