public sector employee

(A) means an individual employed by a State, political subdivision of a State, or Indian tribe and who during the course of employment has responsibilities related to responding to an accident or incident involving the transportation of hazardous material;

(B) includes an individual employed by a State, political subdivision of a State, or Indian tribe as a firefighter or law enforcement officer; and

(C) includes an individual who volunteers to serve as a firefighter for a State, political subdivision of a State, or Indian tribe.