Okla. Stat. tit. 72, § 7

A. All honorably discharged veterans who are currently Oklahoma residents shall be allowed free admission to all state-owned or state-operated parks and museums. A valid Oklahoma driver license or state photo identification card and military discharge papers (DD Form 214) or similar evidence of an honorable discharge from the United States Armed Forces shall be required for free admission. B. A valid Oklahoma driver license or identification card issued by the Department of Public Safety with a flag emblem and the word "veteran" in the upper left-hand corner of the front of the driver license or identification card shall be sufficient for free admission to all state-owned and state-operated parks and museums.