Designated headquarters is defined by the State Travel Guidelines as the area within the boundaries of the incorporated municipality in which a state employee’s place of employment is located. If an employee’s place of employment is located within an unincorporated area, then the area within a five-mile radius of the place of employment is the designated headquarters. If an incorporated municipality or an unincorporated area is completely surrounded by the incorporated municipality in which an employee’s place of employment is located, then the designated headquarters include the surrounded municipality or area.