Thank you sir
Let me start by telling you that there is no "automatic" upgrade. In fact, it is very difficult to obtain one. You have to be able to show error or injustice. Basically you must show either that the court martial
made an error, or that the result reached by the court was unfair
And you have the burden to show this error or injustice.
The process to apply is simple enough
You submit this formhttp://www.dtic.mil/whs/directives/infomgt/forms/eforms/dd0149.pdf
to the board of corrections for military record (address is on the form)
And the board of corrections will make a decision
But the key is in the evidence.
You need to be able to provide evidence that shows either error or injustice.
That is where the lawyer comes in...
You would want to work with an attorney who has experience in military law to help you with the application. They can help you prepare and present the request to the board.
Again, I want to stress, you will need some evidence to show error or injustice.
For example, what you describe, if you were using illegal drugs and broke a window? That is criminal misconduct and can be enough to warrant a BCD.
But if there is evidence that was not presented to the court that mitigates your case (makes it less serious) that can help you convince the board to provide an upgrade to the discharge
Let me know if you have more questions...happy to assist if I can