Cal. MVC § 454

Summary courts-martial may be appointed by the commanding officer of a garrison, fort, post, camp, or other place where troops are on duty, regiment, detached battalion, detached company, or other detachment; but those summary courts-martial may in any case be appointed by superior authority when by the latter deemed desirable: Except when only one officer is present with a command, he or she shall be the summary courts-martial of that command and shall hear and determine cases brought before him or her. After final action by the reviewing authority an authenticated copy of the completed charge sheet shall be filed in the office of the Adjutant General.