(3) "Fireman" means a person employed by the state or by any county or municipal fire department whose duties include extinguishing fires or investigating cases of suspected arson.

"Fireman" means any person who is employed as a professional firefighter on a full-time basis of at least 40 hours per week by any municipal, county, or state government fire department employing three or more firemen and who has the responsibility of [...]

"Fireman" means any person who is employed as a professional firefighter on a full-time basis by any municipal, county, or state government fire department employing three or more firemen and who has the responsibility of preventing and suppressing fires, [...]