71Restrictions on power to impose punishments

71  Restrictions on power to impose punishments  (1) A service tribunal shall not impose a punishment of imprisonment on a defence member whom it has convicted of a service offence unless the tribunal also imposes on that member in respect of that conviction the punishment of dismissal from the Defence Force.  (1A) A service tribunal must not impose on a non‑commissioned officer who has been convicted of a service offence a punishment of detention unless the tribunal also imposes the punishment of reduction in rank to a rank below non‑commissioned rank.  (2) A service tribunal shall not impose a punishment of detention on a defence member who has been convicted of a service offence if the member, at the time of conviction, had not attained the age of 18 years.  (3) A service tribunal shall not impose a punishment of detention on a defence member who has been convicted of a service offence if it also imposes the punishment of dismissal from the Defence Force in respect of that conviction or another conviction.  (4) A service tribunal shall not impose a custodial punishment on a person who is not a detainee.  (5) A custodial punishment imposed on a detainee shall not extend beyond the period during which the detainee is undergoing a punishment of detention in a detention centre.