Okla. Stat. tit. 25, § 90.23

The second Saturday of December of each year is hereby designated as "A Day of Remembrance", and the Governor is authorized and requested to issue a proclamation commemorating the day and honoring soldiers buried at the Fort Gibson National Cemetery and the Fort Sill National Cemetery. On or before the second Saturday in December, holiday wreaths will be placed on the graves of those soldiers in remembrance of their service and to show respect during the holiday season.