How to Apply for Retirement Guidelines to Apply PERS Tiers I, II, III TRS Tiers I, II PERS Tier IV, TRS Tier III (DCR) Retirement Application Forms and Instructions PERS (Defined Benefit) Tiers I, II, III application packet TRS (Defined Benefit) Tiers I, II application packet PERS Tier IV and TRS Tier III (Defined Contribution)