Wis. Stat. § 213.01: Fire Fighters’ Association; powers; military duty.

(1) The Wisconsin State Fire Fighters’ Association organized under the laws of this state is continued, with all of its powers and privileges; and any person having served for the term of 7 years in any company belonging to the association shall be exempt from military duty, except in case of insurrection or invasion.

(2) No engine company or independent hose company belonging to said association shall at any time exceed 50 persons; and no hook and ladder company, 40 persons.