The  power  to  impose  NJP  is  inherent  in the  office  and  not  in  the  individual.  Thus,  the power  may  be  exercised  by  a  person  acting  as CO,  such  as  when  the  CO  is  on  leave  and  the executive   officer   (XO)   succeeds   to   command. OICs  exist  in  the  naval  service.  An  OIC is   a   commissioned   officer   appointed   as   an OIC  of  a  unit  by  departmental  orders,  tables of   organization, manpower   authorizations, orders   of   a   flag   or   general   officer   in command,   or   orders   of   the   senior   officer present. Ordinarily,   the   power   to   impose   NJP cannot  be  delegated.  One  exception  is  that  a flag  or  general  officer  in  command  may delegate  all  or  a  portion  of  his  or  her  Article 15  powers  to  a  principal  assistant.  A  principal assistant  is  a  senior  officer  on  a  flag  or general  officer’s  staff  who  is  eligible  to succeed  to  command.  This  delegation  must be  made  with  the  express  approval  of  the Chief  of  Naval  Personnel  or  the  Commandant of  the  Marine  Corps. Additionally,  where  members  of  the  naval service   are   assigned   to   a   multiservice command, the c o m m a n d e r    of such multiservice   command   may   appoint   one   or more  naval  units  and  for  each  unit  designate a  commissioned  officer  of  the  naval  service  as CO  for  NJP  purposes  over  the  unit.  A  copy of  such  designation  must  be  furnished  to  the Commander, Naval   Military   Personnel Command  or  the  Commandant  of  the  Marine Corps,   as   appropriate,   and   to   the   Judge Advocate   General   (JAG). No   officer   may   limit   or   withhold   the exercise   of   any   disciplinary   authority   under Article   15   by   subordinate   commanders without the specific authorization   of SECNAV. If   a   CO   determines   that   his   or   her authority  under  Article  15  is  not  enough  to make  a  proper  disposition  of  the  case,  he  or she    may    refer    the    case    to    a    superior commander  for  appropriate  disposition. This  situation  could  arise  either  when  the CO’s  NJP  powers  are  less  extensive  than those   of   his   or   her   superior,   or   when   the status  of  higher  authority  would  add  force  to the  punishment,  as  in  the  case  of  a  letter  of reprimand  or  admonition. PERSONS   ON   WHOM   NJP MAY  BE  IMPOSED A  CO  may  impose  NJP  on  all  military personnel  of  his  or  her  command.  An  OIC may   impose   NJP   only   on   enlisted   members assigned to the unit that he or she is in charge of. At  the  time  punishment  is  imposed,  the accused  must  be  a  member  of  the  command of  the  CO  (or  of  the  unit  of  the  OIC)  who imposes  the  NJP. A   person   is   of   the command  or  unit  if  he  or  she  is  assigned  or attached   to   it. This  includes  temporary additional   duty   (TEMADD)   personnel. TEMADD  personnel  may  be  punished  either by  the  CO  of  the  unit  that  they  are  TEMADD to  or  by  the  CO  of  the  duty  station  that  they are  permanently  attached  to.  Note,  however, that   both   COs   cannot   punish   an   individual under   Article   15   for   the   same   offense.   In addition,    a    party    to    a    JAG Manual investigation   remains   a   member   of   the command  or  unit  that  he  or  she  was  attached to  at  the  time  of  his  or  her  designation  as  a party  for  the  sole  purpose  of  imposing  a  letter of  admonition  or  reprimand  as  NJP. Personnel of Another Armed Force Under  present  agreements  between  the armed  forces,  a  Navy  CO  should  not  exercise NJP   jurisdiction   on   Army   or   Air   Force personnel  assigned  or  attached  to  a  naval command.  As  a  matter  of  policy,  return  these personnel  to  their  parent-service  unit  for discipline. If     this     is impractical   and the  need  to  discipline  is  urgent,  NJP  may  be 9-2