As used in this chapter, the term:

(1) “Public agency” means:

(A) Any political subdivision of this state other than a county school district or independent school district;

(B) Any volunteer fire department;

(C) Any volunteer rescue squad;

(D) Any agency of the state government or of the United States; and

(E) Any political subdivision of another state.

(2) “State” means a state of the United States.