Tenn. Code Ann. § 58-8-108

The representative or representatives of the requesting party authorized to be in charge of emergency response at the scene shall be in command at the scene as to strategy, tactics, and overall direction of the operations. The requesting party may delegate command as needed. Generally accepted incident command procedures shall be implemented and followed. The responding party shall designate supervisory personnel for its employees sent to render aid or assistance. All orders or directions regarding the operations of the responding party shall be relayed to the responding party through these designated supervisory personnel unless a different arrangement is determined by the parties in the field to be more advantageous.