Active duty members of the US armed services who are either Oklahoma residents, or stationed in Oklahoma, are entitled to a reduced annual vehicle registration rate of $21.00, $1.50 insurance verification fee and possible $1.00 mail fee. (Note: When registering at a tag agency, the taxpayer has the option to wait or return later for the registration receipt.  Mailing of the receipt is optional.) A completed U.S. Armed Forces Affidavit (Form 779 – available for downloading from the Forms Section of this site), properly attested to by an officer, and proof of liability insurance, must be submitted. Any tag agency can process the registration.