(b) Where the military judge revokes that order, the person shall be required to serve the entire of the sentence of imprisonment or detention originally awarded, or such part of the sentence as the military judge considers just having regard to all the circumstances of the case, less any period of that sentence already served and any period spent in custody (other than a period during which the person was serving a sentence of imprisonment or detention in respect of an offence referred to in subsection (8) of this section) pending revocation of the said order.".