I used to hunt the NF near Oakmulgee, but it's been a while.
The NF lands are not regulated by the Oakmulgee WMA rules.
Look on page 21 of the 2011-12 Regulation Book at the following link for last year's hunting season on NF lands: Regulation Book 2011-2012
The new season will probably be similar.
Make sure you have a map and know how to read it. There are plenty of parcels of privately owned lands surrounded by NF land. Check with the Ranger Station in Brent for a map, or find one online and learn it well.
If you're good at reading maps, this one online will help some. If you're not good at reading maps, you need to get good at it if you're planning on hunting public lands: Oakmulgee Div. NF road map
... or you can buy this one: NF map