Okla. Stat. tit. 74, § 74-911: Employee members

(1) Any employee of a participating employer on the entry date

of such employer shall be a member of the System on the entry date.

(2) Any employee other than a state elected official who is

employed by a participating employer after the entry date of such

employer shall be a member of the System on the first day of the

month immediately following employment.

(3) Any employee who is in military service or on leave of

absence on the entry date of his employer shall become a member of

the System upon his return to active employment.