Tex. Government Code § 824.201: APPLICATION FOR SERVICE RETIREMENT BENEFITS.

(a) A member may apply for a service retirement annuity by filing a written application for retirement with the board of trustees.

(b) At any time before the retirement system makes the first annuity payment or the first annuity payment becomes due, a member may, by filing written notice with the board of trustees, revoke the member's application for retirement or make, revoke, or change a selection of an optional service retirement annuity available as provided by Section 824.204.

(c) Except as specifically provided by this subtitle, a retiree may not revoke a retirement nor make, revoke, or change a selection of an optional service retirement annuity.

Acts 1981, 67th Leg., p. 1876, ch. 453, Sec. 1, eff. Sept. 1, 1981. Renumbered from Vernon's Ann.Civ.St. Title 110B, Sec. 34.201 and amended by Acts 1989, 71st Leg., ch. 179, Sec. 1, eff. Sept. 1, 1989. Amended by Acts 1995, 74th Leg., ch. 555, Sec. 19, eff. Sept. 1, 1995.