There is hereby created the West Virginia Deputy Sheriffs Retirement System. The purpose of this system is to provide for the orderly retirement of deputy sheriffs who become superannuated because of age or permanent disability and to provide certain survivor death benefits, and it is contemplated that substantially all of the members of the retirement system shall be qualified public safety employees as defined in section two of this article. The retirement system constitutes a body corporate. All business of the system shall be transacted in the name of the West Virginia Deputy Sheriffs Retirement System. The board shall specify and adopt all actuarial assumptions for the plan at its first meeting of every calendar year or as soon thereafter as may be practicable, which assumptions shall become part of the plan.