Clause 57

The officers sitting on a court-martial may belong to the same or different corps, or may be unattached to any corps, and may try persons belonging or attached to any corps.

The officer who convenes a court-martial shall not, save as is otherwise expressly provided for by this Act, sit on that court-martial.

Any of the following persons, that is to say, a prosecutor or witness for the prosecution of any accused, or the commanding officer of the accused within the meaning of the provisions of this Act which relate to dealing with a case summarily, or the officer who investigated the charges on which an accused is arraigned, shall not, save in the case of a field general court-martial, sit on the court-martial for the trial of such accused, nor shall he act as judge advocate at such court-martial.