ENLTRANSMAN or due to unanticipated needs of the Navy. The type of duty to which an individual is reassigned upon  completion  of  a  tour  depends  upon  completion  of the  sea  tour  or  shore  tour  as  specified  in  the ENLTRANSMAN,  chapter  3.  The  normal  rotation pattern throughout a career is a repetition of assignments at  sea  and  ashore.  To  the  extent  possible,  initial assignment is to sea duty afloat upon completion of initial entry training. This sea/shore rotation pattern may be modified in individual cases due to variables such as assignment to duty  overseas  (either  at  sea  or  ashore)  or  modified  for an entire rating with a billet orientation that is primarily CONUS  and  overseas  (OUTUS). A   chart   indicating   assignment   priority considerations  for  personnel  selected  to  fill  vacancies  in various types of duty is contained in ENLTRANSMAN, chapter 3. DUTY CLASSIFICATION CODE TYPES Eight  types  of  duty  designations  are  used  to establish  sea/shore  rotation.  Each  of  these  types  of  duty is credited as sea, shore, or neutral duty for rotation purposes. The types of duty are coded in Manpower, Personnel,  and  Training  Information  Systems (MAPTIS)  and  are  shown  in  each  command’s  Enlisted Distribution  and  Verification  Report  (EDVR)  as  a sea/shore code (SSC). These codes are assigned and, when  required,  changed  by  CHNAVPERS.  To determine the type or duty codes, the following criteria are  applied: Shore duty (SSC 1) is duty performed at CONUS land-based   activities   and   long-term   schooling programs. (Long term is defined as 18 or more months; school  assignments  of  less  than  18  months  are considered  neutral  duty.)  Members  are  not  required  to be absent from corporate limits of their duty station in excess of 99 days per year. Sea  duty  (SSC  2)  is  duty  performed  in commissioned  vessels  or  at  activities  in  an  active  status home-ported/home-based in CONUS that operate away from their home port or home base in excess of 150 days per  year. Overseas shore duty (SSC 3) is duty performed at overseas land activities that is credited as sea duty for rotational purposes as determined by CHNAVPERS. NOTE: At the time of the writing of this training manual this definition was being changed. Refer to the current definition in the ENLTRANSMAN, chapter 3. Nonrotated sea duty (SSC 4) is duty performed in commissioned vessels in an active status home-ported overseas (outside CONUS) or at activities that operate away from their overseas home port or home base in excess of 150 days per year. Neutral  duty  (SSC  5)  is  duty  performed  at activities  that  would  normally  be  designated  as  shore duty for rotation, but where the members assigned are required to be absent 100 to 150 days per year from the corporate limits of their duty station, while performing their assigned tasks. School assignments of less than 18 months  are  included  in  this  category. Preferred overseas shore duty (SSC 6) is duty performed  at  overseas  land-based  activities  that  is credited  as  shore  duty  for  rotational  purposes  as determined by CHNAVPERS. NOTE: At the time of the writing of this training manual this definition was being changed. Refer to the current definition in the ENLTRANSMAN,  chapter  3. Partial sea duty (SSC 7) is duty performed at overseas land-based activities that is credited as shore duty  for  rotational  purposes,  but  where  members assigned receive partial sea duty credit according to guidelines  established  in  the  ENLTRANSMAN,  chapter 4, Article 4.0513. Double sea duty (SSC 8) is duty performed in commissioned  vessels  or  at  activities  in  an  active  status that operate away from their home port or home base in excess of 150 days a year, but because of the nature of their mission are awarded double sea credit for the tour served. TYPES OF DUTY Members can be assigned to different types of duty stations; for example, a member can be assigned to overseas  duty.  Qualifications  for  overseas  duty  are contained in the ENLTRANSMAN, chapter 4, and are discussed later. A member can be assigned to submarine duty.  An  applicant  for  submarine  duty  must  meet eligibility requirements o u t l i n e d    i n    t h e ENLTRANSMAN,  chapter  5,  and  other  applicable publications  such  as  the  Manual   of   the   Medical Department (MANMED). A member can be assigned to nuclear   power   training   as   set   forth   in   the ENLTRANSMAN,  chapter  6.  A  member  can  be assigned   to   special   programs   according   to   the ENLTRANSMAN, chapter 9. A member can also be 2-13