Okla. Stat. tit. 51, § 51-121: Declaration of policy

In order to extend to employees of the state and its political

subdivisions and of the instrumentalities of either, and to the

dependents and survivors of such employees, the basic protection

accorded to others by the old-age and survivors insurance system

embodied in the Social Security Act, it is hereby declared to be the

policy of the Legislature, subject to the limitations of this act,

that such steps be taken as to provide such protection to employees

of the state and local governments on as broad a basis as is

permitted under applicable federal law. It is also the policy of

the Legislature that the protection afforded employees in positions

covered by a retirement system on the date an agreement under this

act is made applicable to service performed in such position, or

receiving periodic benefits under such retirement system at such

time, will not be impaired as a result of making the agreement so

applicable or as a result of legislative enactment in anticipation

thereof.