prisoners, or holdees, and who are counted using the assigned rate fields or distribution NEC fields as shown on   the   Enlisted   Distribution   Verification   Report (EDVR). Normally, personnel assets and billets are managed  by  ratings.  However,  because  of  highly specialized training, certain individuals and billets are managed by the NEC independent of rating. When BUPERS determines that an NEC will be managed as a distributable community, independent of rating, the NEC is designated either Closed Loop or Transitory. The   Closed   Loop   NEC   distributable   community consists  of  personnel  who  are  projected  and  assigned  to consecutive  tours  within  that  NEC  skill  area. A Closed Loop NEC distributable community is normally associated with one rating or group of ratings sharing a common occupational skill, and where the member has earned a highly specialized talent within his or her general rating experience. The person is managed based solely on this NEC skill. A Transitory NEC distributable community consists of  a  combination  of  ratings  sharing  a  common supplemental  skill  that  may  not  be  generically associated with the individual’s actual rating. This individual  is  managed  by  the  NEC   only   during completion of a Transitory NEC tour; the member is reassigned to a requirement within his or her primary rating. .  Detailing  composites.  Having  determined  the individuals and billets that will be managed by rating or NEC, the total Navy billet structure is subdivided into detailing  composites.  The  first  division  designates billets as either sea or shore. This sea/shore division indicates whether a billet is counted as sea duty or shore duty   for   personnel   rotation.   The   sea   and   shore composites are further subdivided into submarine billets and nonsubmarine billets. The nonsubmarine composite is termed the sea-surface/air composite. The shore, sea-surface/air, and sea-submarine composites are again subdivided  into  seven  paygrades.  (Paygrades  E-1 through  E-3  are  considered  one  paygrade  in  this division.)  Finally,  each  paygrade  is  subdivided  into  four MCAs representing the billets for which each of the MCAs  has  responsibility.  Figure  3-1  shows  these detailing subdivisions. The end result is to project future personnel strength and allocate personnel assets to each MCA   by   paygrade   within   the   rating   or   NEC. Considering   each   rating   and   NEC   distributable community and the subdivisions, the system is capable of projecting and allocating these assets to some 3,300 distinct  detailing  communities. Figure  3-1.-Breakdown  of  detailing  communities. Navy  Manning  Plan Since  personnel  assets  rarely  equal  manpower requirements,  distribution  managers  are  faced  with  the problem of how best to use assets that are short or those in  excess  of  personnel  requirements.  To  solve  this problem  requires  a  manning  plan  that  will  determine how shortages and excesses will be distributed. This plan is called the Navy Manning Plan (NMP). Using the projected  level  of  assets  and  the  billets  authorized  to activities, the NMP determines the most equitable level of  manning  an  activity  can  expect.  Additional information concerning the NMP can be obtained from the Enlisted  Transfer  Manual  (ENLTRANSMAN), NAVPERS 15909D, chapter 1. Personnel Requisition The  projection  system  predicts  the  level  of manpower assets and provides a base upon which the MCA can build a manning plan that will provide an equitable distribution of the assets to each activity. Each MCA  must  communicate  its  activity’s  qualitative  and quantitative   personnel   needs   to   the   ACA.   This communication  is  provided  by  the  personnel  requisition system.  The  personnel  requisition’s  function  is  to measure activity personnel needs to bring the activity first to its manning plan, and second, if assets are available,  from  manning  plan  to  full  allowance.  A second function is to communicate to the ACA in what sequence  personnel  are  to  be  assigned  to  activities  in order to fill their requisitions. Requisition  Priorities The  Chief  of  Naval  Operations  (CNO)  and  the MCAs have directed that certain activities be given priority  in  the  assignment  of  personnel  assets.  These 3-2