Citing Afghanistan precedent, nothing needs to be returned.
So the OK national guard is equivalent to the Afghan forces. The USA is not leaving OK they are demanding compliance and threatening to remove the Federal government backing of the OK forces. If you believe they will just turn over all the tanks, armoured vehicles and heavy weapons you are insane. It is more likely they send active duty troops to retrieve them or ask for some third party to do it like the UN which would make it an international peacekeeping mission with the security Council full blessing I’m sure. Imagine blue helmets going into former guard armouries what a media circus that would be. Russia and China for sure would offer to send tier one operators for the peacekeeping mission. I personally took part in disarming parts of Kosovo for the UN and NATO those Serbian and Kosovo militias also screamed these are out arms once the government fell welp no the rest of the world didn’t see it that way and we have IFOR 4 through 7 to prove that in the history books. Personally I’d love to see some good ole boy OK kick off the hot war it’s past time to get it on anyways mine as well start a half hour from my front door makes getting to the FEBA all the easier.