(a) An officer or enlisted service member in the Texas military forces who complies with the service member’s military duties as prescribed by this chapter is exempt from payment of a road or street tax.
(b) To obtain the exemption, a service member must file in the county tax assessor-collector’s office an affidavit, sworn to before a notary public or other person authorized to administer oaths in this state, in the following form:

“I, __________, do hereby solemnly swear or affirm that I am a service member in good standing of the Texas military forces of the State of Texas.
Subscribed to and sworn to before me this ______ day of __________, ______
SEAL
________________________
________________________
Notary Public in and for
__________ County, Texas”
(c) The county tax assessor-collector may rely on a letter issued by the commander of the service member’s unit for purposes of providing the exemption under this section.