(1) Whenever a sentence of a court-martial as lawfully adjudged and approved includes a forfeiture of pay or allowances in addition to confinement not suspended, the forfeiture may apply to pay or allowances becoming due on or after the date the sentence is approved by the convening authority.
(2) No forfeiture may extend to any pay or allowance accrued before that date.
(3) Rules prescribed by the Governor may provide that sentences of confinement may not be effective or executed until approved by designated officers.
(4) Periods during which confinement is suspended shall be excluded in computing the service of the term of confinement.
(5) All other sentences of courts-martial are effective on the date ordered executed.