California Code, Government Code - GOV § 31642

(a) A temporary layoff because of illness or for purposes of economy, suspension, or dismissal, followed by reinstatement or re-employment within one year.

(b) A leave of absence followed by reinstatement or re-employment within one year after the termination of the leave of absence.

(c) A resignation to enter, followed by entrance into, the armed forces of the United States, followed by re-employment by the county or district within six months after the termination of such service.

(d) Resignation of a member who has elected in writing to come within the provisions of Article 9 followed by re-employment before withdrawal of any accumulated contributions.

The withdrawal of accumulated contributions followed by the redeposit of the contributions upon re-entrance into service does not constitute a break in the continuity of service.