Ref: MILPERSMAN 1306-102
Five types of duty designations or “types” are used to identify commands for establishment of sea/shore rotation.
(1) Shore Duty (Sea/Shore Type Duty Code "1"): Duty performed in United States (U.S.) (including Hawaii and Anchorage, Alaska) land-based activities where members are not required to be absent from the corporate limits of their duty station in excess of 150 days per year, or long-term schooling of 18 or more months.
(2) Sea Duty (Sea/Shore Type Duty Code "2"): Duty performed in commissioned vessels and deployable squadrons homeported in the U.S. (including Hawaii and Alaska); U.S. land-based activities and embarked staffs, which require members to operate away from their duty station in excess of 150 days per year.
(3) Overseas Remote Land-based Sea Duty (Sea/Shore Type Duty Code "3"): Duty performed in a land-based activity, which does not require members to be absent more than 150 days per year, but is credited as sea duty for rotational purposes only due to the relative undesirability of the geographic area.
(4) Overseas Sea Duty (Sea/Shore Type Duty Code "4"): Duty performed in commissioned vessels and deployable squadrons homeported overseas; overseas land-based activities and embarked staffs, which require members to operate away from their duty station in excess of 150 days per year.
(5) Overseas Shore Duty (Sea/Shore Type Duty Code "6"): Duty performed in overseas land-based activities, which are credited as shore duty for rotational purposes. Members are not required to be absent from corporate limits of their duty station in excess of 150 days per year.
Each of these types of duty is credited as sea or shore duty for rotation purposes. The types of duty are reflected 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 Pers-451.
When the mission, functions, or the relative desirability of the location of an activity change, it may be appropriate to submit a request for change in Type Duty Code to NAVPERSCOM, Distribution Management and Procedures Branch (PERS-451) via the appropriate chain of command. The appropriate immediate superior in the chain of command (ISIC) and manpower claimant must endorse all requests. Requests will be returned without action if not accompanied by the proper endorsements.