They court martialed Billy Mitchell, too. And found him guilty. You can’t do this while still holding a commission. You either embrace the suck or you resign. After you resign, you can say anything you want. It’s a tough choice financially, for a colonel, because he’s giving up a substantial pension, but it has to be done that way.
Those familiar with UCMJ said at the time this was inevitable, and Scheller knew it too.