Final answer:
The answer is 'Area of Responsibility (AOR),' which upon its establishment, requires Regional Command Posts to follow the same guidance as Consolidated Command Posts. The correct option is B.
Step-by-step explanation:
The correct answer to the question 'Once ________ is established, Regional Command Posts follow the same guidance as Consolidated Command Posts/Command Post Associations' is B.
Area of Responsibility (AOR). After an Area of Responsibility is established, Regional Command Posts are expected to adhere to the same protocols and guidance as their counterparts in Consolidated Command Posts/Command Post Associations.
This is significant in military and defense contexts where hierarchy and adherence to established guidelines are paramount for coherent operations.