Okla. Stat. tit. 11, § 11-49-139

absence - Advancements and promotions - Reinstatement - Reduction of

compensation or dismissal.

Any such person shall be carried on the roll of members of the

fire department during such absence and shall be entitled to all

advancements, seniority and promotions under the rules, regulations

and customs of the fire department, during his said absence, and all

advancements and promotions made in the fire department during his

absence in such military or naval service to which he would have

been entitled shall only be filled temporarily and shall be subject

to the rights of such person who shall, within ninety (90) days

after he has been honorably discharged or received a certificate as

a reserve component of the land or naval services, have the right to

make application for reinstatement, and he shall have preference

over any and all members of the fire department who have been

employed by such municipality subsequent to his entering said

military or naval service, and upon such application it shall be the

duty of the executive head of the fire department to reinstate such

person as an actual member of the fire department with all rights of

advancements and promotions, provided, he has not been mentally or

physically disabled since last serving in such fire department and

is able to pass the usual and customary physical and mental

examination then required by the State Board for entry into said

fire department, and he shall not thereafter be subject to reduction

of compensation or dismissal without just cause.