The IAP usually covers 12 hours. IAPs, based on FEMA's Incident Command System (ICS), include a briefing on health and safety requirements that the emergency/first responders should observe, the primary materials and hazards that drive the health and safety requirements, and operational challenges that the emergency/first responders will face. Emergency responders may include a variety of operational branches, agencies and disciplines, depending on the type and magnitude of the incident. Hurricane Katrina, one of the most devastating natural disasters in U.S. history in 2005. what is the Incident Action Planning Guide that applies to this incident