A defeat by Oklahoma to stop the federal vaccine mandate for national guardsmen did not deter Texas from attempting to do the same, but Texas might succeed where its neighbor did not.

Oklahoma was the first state to challenge a Department of Defense mandate that affected its national guard servicemembers. The interim outcome of Oklahoma v. Biden was a Dec. 28 order in the U.S. District Court for the Western District of Oklahoma, denying the state’s motion for a preliminary injunction.