Subd. 1.

If the convening authority disapproves the findings and sentence of a court-martial the convening authority may, except where there is lack of sufficient evidence in the record to support the findings, order a rehearing. In such a case the convening authority shall state the reasons for disapproval. If the findings and sentence are disapproved and a rehearing is not ordered, the charges shall be dismissed by the convening authority.

Subd. 2.

Each rehearing shall take place before a court-martial composed of members not members of the court-martial which first heard the case. Upon a rehearing the accused may not be tried for any offense of which the accused was found not guilty by the first court-martial, and no sentence in excess of or more severe than the original sentence may be imposed, unless the sentence is based upon a finding of guilty of an offense not considered upon the merits in the original proceedings, or unless the sentence prescribed for the offense is mandatory.