Answer:
Field-Level Briefing
Explanation:
In the context of The Incident Command System, it can be said that this type of briefing is called a Field-Level Briefing. Like mentioned in the question it is a briefing delivered to individual subordinates, full crews, or multiple crews such as Strike Teams or Task Forces at or near the incident sites, usually at the beginning of their shifts in order to catch them up to speed on what the situation entails and what needs to be done, as well as the precautions to take.
