In this subchapter:
(1) “Fire emergency” means an emergency response involving fire protection or prevention, rescue, emergency medical, or hazardous material response services.
(2) “Fire fighter” means an employee of a nonprofit fire department.
(3) “Governmental unit” has the meaning assigned by Chapter 101.
(4) “Nonprofit fire department” means a nonprofit organization that is:
(A) exempt from federal income tax under Section 501(a) of the Internal Revenue Code of 1986 (26 U.S.C. § 501(a)) by being listed as an exempt organization in Section 501(c)(4) of that code;
(B) composed of member owners; and
(C) organized to offer and provide:
(i) fire protection, prevention, and inspection services; and
(ii) emergency response services, including rescue, emergency medical, and hazardous material response services.