(1) A court-martial sentence involving a general officer or extending to the dismissal of an officer other than a general officer shall not be executed until approved by the governor. The governor may approve the sentence or a part, amount, or commuted form of the sentence and may suspend the execution of the sentence or any part of the sentence.

  (2) A sentence which includes an unsuspended, dishonorable, or bad conduct discharge shall not be executed until approved by an officer exercising general court-martial jurisdiction. That officer may approve the sentence or a part, amount, or commuted form of the sentence and may suspend the execution of the sentence or any part of the sentence.

  (3) Any other court-martial sentence, unless suspended, may be ordered executed by the convening authority when approved by the convening authority. The convening authority may approve the sentence or a part, amount, or commuted form of sentence, and may suspend the execution of the sentence or any part of the sentence.