I know that the extended war has reduced funding for a lot of things in the OK National Guard, but here is some first hand experience.
I retired from the OK Air Nationa Guard five years ago and was heavily involved in the OK National Guard's shooting program. The OK National Guard used to have the Sgt. Major's match in the spring and the Governor's 20 match in the fall. The shooter with the highest combined score of those two matches would be awarded the Hadwiger Award. They also held machine gun and sniper matches. The matches were not exclusive at all. Many units would use them for their troops' periodic weapon qualifications.
Getting on the state team was VERY exclusive. Lazy people that couldn't shoot were not allowed on it. There were pistol, rifle, machine gun and sniper teams. The airmen or soldiers from the winning unit were selected to represent the state at the Wilson Matches in North Little Rock, Arkansas. The match was usually held on OU/Texas weekend. Pistol and rifle team members for the Wilson Matches were selected from the winning unit at the Governor's 20 match and backfilled as required by the top ten finishers of the two state matches. I don't know how machine and sniper teams were filled, since I never participated in those disciplines.
There were many other opportunities throughout the year to participate in regional military matches as well.
I don't know who is in charge anymore, but if I needed to find out I would talk to Col Curtis Bohlman. He used to work at 23 St Armory in OKC.