You may waive your defined benefit in Plan 3, unless your retirement is impacted by a legal order. Waiving your defined benefit is an irrevocable decision. You cannot repurchase service credit once it has been waived. Spousal consent is required to waive the defined benefit. To waive your benefit fill out a Plan 3 Defined Benefit Waiver.
Some retirement plans have provisions which allow members to transfer contributions and/or service credit earned elsewhere into their retirement plan. The Legislature created this waiver to allow you to give up your benefit in Washington state, so you can claim service and benefits in another plan.