(a) A commissioned officer of the United States armed forces or of a United States armed forces auxiliary may administer an oath made by a member of the armed forces, a member of an armed forces auxiliary, or a member's spouse and may give a certificate of the fact.
(b) Unless there is pleading or evidence to the contrary, a certificate signed under this section that is offered in evidence establishes that:
(1) the commissioned officer who signed was a commissioned officer on the date the officer signed; and
(2) the person who made the oath or affidavit was a member of the armed forces or an armed forces auxiliary or was a member's spouse when the oath was made.
(c) An oath is not invalid because the commissioned officer who certified the oath did not attach an official seal to the certificate.