In order to help form a common operating picture of the incident and secure additional resources, the Incident Commander relays requirements to:

In order to form a common operating picture of the incident and secure additional resources, the Incident Commander relays requirements to the local Emergency Operations Center (EOC).

The local Emergency Operations Center (EOC) helps to form shared situational awareness, relieves on-scene command of external coordination burdens, and secures additional resources to meet response requirements, acting as a critical nexus for supporting on-scene efforts with necessary resources and information.

Source: https://training.fema.gov/emiweb/is/is800d/english/instructor%20guide/el0800.d%20ig.pdf