The provisions of AS 14.25.310 - 14.25.590 apply only to teachers who first become members on or after July 1, 2006, to members who are employed by employers that do not participate in the defined benefit retirement plan established under AS 14.25.009 - 14.25.220, to former members under AS 14.25.220, or to members who transfer into the defined contribution retirement plan under AS 14.25.540.