Gov. Code, § 21029

(a) “Public service” with respect to a state member or a school member or with respect to a retired former state employee or a retired former school employee, who retired on or after December 31, 1981, also means active service, prior to entering this system as a state member or as a school member, of not less than one year in the Armed Forces of the United States, or, active service, prior to entering this system as a state or school member, of not less than one year in the Merchant Marine of the United States. Public service credit shall not be granted if the service described above terminated with a discharge under dishonorable conditions. The public service credit to be granted for that service shall be on the basis of one year of credit for each year of credited state service, but shall not exceed a total of four years of public service credit regardless of the number of years of either that service or subsequent state service. A state member or a school member or a retired former state employee or a retired former school employee electing to receive a credit for that public service shall have been credited with at least one year of state service on the date of election or the date of retirement.

(b) An election by a state member or a school member with respect to public service under this section may be made only while the member is in state, university, or school employment, and a retired former employee shall have retired immediately following service as a state member or as a school member. The retirement allowance of a retired former state employee or a retired former school employee, who elects to receive public service credit pursuant to this section shall be increased only with respect to the allowance payable on and after the date of election. For the purposes of this section, a member as described in subdivision (d) of Section 20776, shall also mean a former state employee or a former school employee, who retired on or after December 31, 1981.

(c) A member or retired former employee who elects to become subject to this section shall make the contributions as specified in Sections 21050 and 21052.

(d) The board has no duty to locate or notify any eligible former member who is currently retired or to provide the name or address of any such retired person, agency, or entity for the purpose of notifying those persons.

(e) An employer shall inform a new employee at the time of hire of their rights to purchase service credit under this section.