Basil, the Wing Commander may have elected for a Court Martial in order to get a Not Guilty verdict. That, if he gets it, would be better for him than it being kept quiet at station level.
The chain of command have an option to drop it if the service prosecutor is not convinced of a reasonable chance of a guilty verdict.
At least with a CM the accused gets to put his side of the case to a wider audience. Trial by media is not necessarily a bad thing. He's currently accused of assaulting them, a trial is the best place to determine if it was a defensive action.