The lives of a group of public employees may be insured under a policy issued to the departmental head or to a trustee, or issued to an association of public employees formed for purposes other than obtaining insurance and having, when the policy is placed in force, a membership in the classes eligible for insurance of not less than seventy-five percent of the number of employees eligible for membership in such classes, which department head or trustee or association shall be deemed the policyholder, to insure such employees for the benefit of persons other than the policyholder or any of its officials, subject to the following requirements:
(1) The persons eligible for insurance under the policy shall be all of the employees of the department or members of the association, or all of any class or classes thereof determined by conditions pertaining to their employment, or to membership in the association, or both.
(2) The premium for the policy shall be paid by the policyholder, in whole or in part either from salary deductions authorized by, or charges collected from, the insured employees or members specifically for the insurance, or from the association's own funds, or from both. Any such deductions from salary may be paid by the employer to the association or directly to the insurer. No policy may be placed in force unless and until at least seventy-five percent of the then eligible employees or association members, excluding any as to whom evidence of individual insurability is not satisfactory to the insurer, have elected to be covered and have authorized their employer to make any required deductions from salary.
(3) The rate of charges to the insured employees or members specifically for the insurance, and the dues of the association if they include the cost of insurance, shall be determined according to each attained age or in not less than four reasonably spaced attained age groups. In no event shall the rate of such dues or charges be level for all members regardless of attained age.
(4) The policy must cover at least twenty-five persons at date of issue.
(5) The amounts of insurance under the policy must be based upon some plan precluding individual selection either by the employees or members or by the association.
As used herein, "public employees" means employees of the United States government, or of any state, or of any political subdivision or instrumentality of any of them.