That Federal Property in transit is Federal Property and thus exempt from any State or Local Regulation is a well established precedent. I'm surprised Oklahoma even got the issue to be heard by a court. Back in the late 'Sixties, California found, to the dismay of the anti-war activists that promoted and passed the legislation (by referendum
... go figure), that the state had no authority to prohibit or otherwise regulate the transit of military materiel or personnel. Some years back, a County Cop here in Wisconsin tried to ticket an Army Lo-Boy rig transporting a big piece of construction equipment or something, for not having the proper state-issued permits. The cop's career path suffered significant long-term harm.