Tex. Transp. Code § 521.028
(a) Unless the license is suspended, canceled, or revoked as provided by law, a driver's license issued by this state that is held by a person who is on active duty in the armed forces of the United States and is absent from this state, notwithstanding the expiration date of the license, remains valid while the person is absent from this state. If the person is honorably discharged from active duty, the license remains valid until the earlier of:
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.