Which major NIMS Component describes recommended organizational structures for incident management at the operational and incident support levels?

The major NIMS Component that describes recommended organizational structures for incident management at the operational and incident support levels is the Command and Coordination component.

Command and Coordination component outlines how the Incident Command System (ICS), Emergency Operations Centers (EOCs), Multiagency Coordination (MAC) Groups, and Joint Information Systems (JIS) operate to manage incidents effectively, ensuring that different elements within these structures can interact and integrate seamlessly.

Source: https://training.fema.gov/emiweb/is/is700b/handouts/national_incident_management%20system_third%20edition_october_2017.pdf