Cal. Mil. & Vet. Code § 567

This chapter shall take effect on the day following the day on which the National Guard or any part thereof is in federal service or on the day following the day on which Congress consents to the organization and maintenance of said forces, whichever event first occurs shall be the effective date hereof, and shall be effective forthwith upon approval by the Governor with respect to the authority granted in this act to the Governor to organize and maintain said forces at cadre strength at any time.