Which Incident Type requires regional or national resources, all Command and General Staff positions are activated, branches are activated, personnel may exceed 500 per operational period, and a disaster declaration may occur?

The Type 1 Incident is characterized by its need for substantial resources due to the complexity and scale of the situation. In this type of incident, the operation might require regional or even national resources, which signifies that the event's impact or scale surpasses what local resources can handle effectively. The activation of all Command and General Staff positions indicates that the incident is significant enough to necessitate a full command structure, ensuring that all responsibilities for planning, operations, logistics, and finance are adequately addressed.

Furthermore, the branching structure that is activated under a Type 1 incident allows for organized management of multiple aspects of a complex incident, which could involve various categories of operations concurrently. When personnel numbers exceed 500 within an operational period, this demonstrates a large-scale mobilization of resources and personnel, indicative of extensive operational needs. The likelihood of a disaster declaration further underscores the severe nature of the incident, emphasizing the need for federal assistance to adequately respond.

Overall, the parameters outlined in the question—resource requirements, the activation of Command and General Staff positions, extensive personnel involvement, and the potential for disaster declaration—are all hallmarks of a Type 1 Incident according to the NIMS Incident Command System.