Okla. Stat. tit. 26, § 26-14-145: Ballot validity

To be valid, a military-overseas ballot must be received by the

appropriate local election official not later than the close of the

polls, or the voter must submit the ballot for electronic

transmission or other authorized means of delivery not later than

12:01 a.m., at the place where the voter completes the ballot, on

the date of the election.