‘Firefighter’ means a member who is:

1.  Filling a full-time position with a participating public employer, the principal duties of which require emotional stability and physical capacity in protecting the public and controlling and extinguishing fires.

2.  The former holder of a position defined in subsection 1 who has:

(a) Earned at least 2 years of creditable service in that position; and

(b) Been promoted or transferred within the chain of command by the same public employer to a position related to protecting the public and controlling and extinguishing fires.

3.  The former holder of a position defined in subsection 1 who:

(a) Has earned at least 2 years of creditable service in that position; and

(b) Is employed by a different public employer in a position that would have been eligible under paragraph (b) of subsection 2 had the member remained with the member’s former employer.