There is created the Oklahoma Police Pension and Retirement System which shall be a body corporate and an instrumentality of this state. The System shall be vested with the powers and duties specified in this act and such other powers as may be necessary to enable it and its officers and employees to carry out fully and effectively the purposes and intent of this article. All assets of the System shall be held in trust for the exclusive purpose of providing benefits for the members and beneficiaries of the System, including defraying reasonable expenses of administering the System, and shall not be encumbered for or diverted to any other purpose. This System shall be the responsibility of the state and not that of the participating municipalities.