Sec. 521.027.  PERSONS EXEMPT FROM LICENSE REQUIREMENT.  The following persons are exempt from the license requirement imposed under this chapter:
(1)  a person in the service of the state military forces or the United States while the person is operating an official motor vehicle in the scope of that service;
(2)  a person while the person is operating a road machine, farm tractor, or implement of husbandry on a highway, unless the vehicle is a commercial motor vehicle under Section 522.003;
(3)  a nonresident on active duty in the armed forces of the United States who holds a license issued by the person's state or Canadian province of residence;  and
(4)  a person who is the spouse or dependent child of a nonresident exempt under Subdivision (3) and who holds a license issued by the person's state or Canadian province of residence.
Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.