Final answer:
The National Incident Management System (NIMS) mandates incident management training, which provides a consistent nationwide template for managing emergencies and was developed due to past criticisms of FEMA and a move towards centralized federal power.
Step-by-step explanation:
The federal directive that mandates incident management training is the National Incident Management System (NIMS), which was developed by the Federal Emergency Management Agency (FEMA). NIMS provides a consistent nationwide template to enable all government, private-sector, and non-governmental organizations to work together during domestic incidents.
After the criticized response to Hurricane Katrina and the acknowledgement of the ineffectiveness of FEMA to coordinate different agencies, as well as the centralization of disaster response power in the creation of the Department of Homeland Security, the importance of standardized emergency management training became clear. The goal of NIMS is to provide a common approach to managing emergencies ranging from the response to natural disasters to acts of terrorism.