In this subchapter:
(1) "Emergency response" means a response involving fire protection or prevention, rescue, emergency medical, or hazardous material response services.
(2) "Volunteer fire department" means a nonprofit organization that is:
(A) operated by its members;
(B) exempt from the state sales tax under Section 151.310, Tax Code, or the state franchise tax under Section 171.083, Tax Code; and
(C) organized to provide an emergency response.
(3) "Volunteer fire fighter" means a member of a volunteer fire department.