Area Of Responsibility (AOR) is an acronym used to define an area with specific geographic boundaries for which a person or organisation bears a certain responsibility.
In the military, an AOR is a pre-defined geographic region assigned to a Unified Combatant Command. This system is designed to allow a single commander to exercise command and control of all military forces in the AOR, regardless of their branch of service. A Unified Combatant Command is composed of forces from two or more services, has a broad and continuing mission, and is organized either on a geographical basis (known as Area Of Responsibility, AOR) or on a functional basis. ...
For instance, the AOR for United States European Command is defined here: http://www.eucom.mil/english/AOR/main.asp The U.S. European Command (EUCOM) is Unified Combatant Command of the United States military, headquartered in Stuttgart, Germany. ...
The term may also be used in other realms but originated with the US military.
Area of Responsibility: The Dallas Field Division is responsible for DEA ROs located in Amarillo, Fort Worth, Lubbock, Midland, and Tyler, Texas, as well as the State of Oklahoma.
Area of Responsibility: The Los Angeles Field Division is responsible for DEA ROs located in Riverside, Santa Ana, and Santa Barbara, California, in addition to Hawaii, Nevada, and Guam.
Area of Responsibility: The Miami Field Division is responsible for DEA DOs and ROs located in Florida, the Commonwealth of Puerto Rico, the U.S. Virgin Islands, and Country Offices located in The Bahamas, Barbados, the Dominican Republic, Haiti, and Jamaica.