Indiana Code Title 36. Local Government § 36-8-7-18

Sec. 18. (a) Notwithstanding section 17 of this chapter, each member of the fire department who was in active service on March 2, 1937, but who was not a member of the firemen's pension fund, is conclusively considered to be a member of the 1937 fund and shall pay, in addition to the member's previous assessments, the same amount into the 1937 fund for unpaid assessments that the member would have paid as assessments if the member had been a member of the 1937 fund during all of the years of the member's service.

(b) A member of the fire department who:

is entitled to all of the benefits of the 1937 fund with all of the years of active service with the fire department counted in determining the member's eligibility for retirement.