Firefighter members; contributions; benefit eligibility; service and disability retirement benefits; termination of benefits upon failure to make timely contribution payments. (a) In addition to contributions paid under W.S. 9-3-412 and 9-3-413, each firefighter member shall pay into the account nine and sixty-five hundredths percent (9.65%) of his salary to qualify for benefits under this section. The employer of the firefighter member may pay any or all of the employee contributions imposed under this subsection. The board may increase the contribution percentage required under this subsection by not more than one percent (1%), as necessary to maintain the actuarial integrity of the account as affected by benefits payable under this section. Payments under this subsection shall be made monthly to the account in accordance with W.S. 9-3-412 and 9-3-413. (b) Normal retirement benefits are payable under this section to any firefighter member who: (i) Has at least four (4) years of service credit as a firefighter member and is at least sixty (60) years of age; (ii) Has at least twenty-five (25) years of service credit as a firefighter member and is at least fifty (50) years of age; or (iii) Is at least fifty-five (55) years of age and has a combined total years of age and years of service credit as a firefighter member which equals not less than seventy-five (75). (c) Early retirement benefits are payable under this section to any firefighter member who: (i) Has at least four (4) but less than twenty-five (25) years of service credit as a firefighter member and is at least fifty (50) but less than sixty (60) years of age; or (ii) Is less than fifty (50) years of age and has at least twenty-five (25) years of service credit as a firefighter member. (d) The early retirement benefit amount payable under subsection (c) of this section is equal to the normal retirement benefit amount payable under subsection (b) of this section reduced to an actuarial equivalent amount as prescribed by rule and regulation of the board. (e) The normal benefit for a firefighter member under this section is equal to two and one-half percent (2 ½%) of the highest average salary, as defined by W.S. 9-3-402(a)(xix)(A), multiplied by the member's years of service credit as a firefighter member. (f) Upon retirement for a partial or total disability as determined and for which the member otherwise qualifies under W.S. 9-3-422, a firefighter member shall receive a monthly disability retirement benefit for the period of qualified disability equal to sixty-five percent (65%) of his salary at the time the disability was incurred. Disability benefits are payable under this subsection for the life of the firefighter member or until the firefighter member is no longer disabled. The firefighter member is subject to reporting, evaluation and excess earnings deduction requirements imposed under W.S.