Haw. Rev. Stat. § 88-158

Whenever any member of the police force, fire department, or band of any county shall, on examination by the medical board provided for in section 88-155, be found to be disabled physically or mentally because of any injury received or disease contracted while in the performance of the member's duty so as to render necessary the member's retirement from the service on the police force, fire department, or band of the county, then the board of trustees shall authorize a monthly payment to the person from the pension system of a sum equal to not less than one-quarter nor more than three-quarters of the person's average monthly compensation for the ten years (or less, if the person has had less than ten years) of the person's service, as defined in section 88-166, immediately preceding the person's adjudication of disability by the medical board.