Okla. Stat. tit. 18, § 18-594: Fire departments for unincorporated areas - Status as

state agency - Nonliability for tort.

Any charitable corporation formed in an unincorporated area for

the purpose of providing either a volunteer or a full-time fire

department, such as is mentioned in Section 592 of this title, shall

be considered an agency of the State of Oklahoma while actually

performing the function of providing fire protective services either

within or without the unincorporated area wherein it is situated,

and while so engaged such corporation shall not be liable in tort

for the acts of its members or its firemen.