Documenting Military Sea Service

Crediting Military Sea Service

Military sea service may be counted towards the sea service required to become a mariner. This military sea service is only part of the evaluation process. Documentation is key and must be submitted with the MMC application package to a Regional Exam Center.


The following military service is evaluated in accordance with 46 Code of Federal Regulations 10.232 and Marine Safety Manual Vol III, Part A, Chapter II:

  • Vessel name
  • GRT or displacement tonnage
  • Propulsion Power
  • Dates assigned to the vessel
  • Position served (BMC, SK1, LT, etc.)
  • Propulsion Power


Per 46 CFR 10.232(d), as interpreted in Marine Safety Manual Chapter 2, military evaluations require the applicant to provide a Transcript of Sea Service (TOSS), History of Assignments, or acceptable military tracking software printout documenting all information required by 46 CFR 10.232(a).


Sea service documentation must contain vessel information such as the name of each vessel or its official number, the period of time the mariner was assigned to each vessel, horsepower, tonnage, area of operation, rating for enlisted or rank for officers, and position held while assigned to a vessel.

a) A DD-214 form will not be accepted to document sea service because it does not include all of the required information.

b) Shipboard- or Unit-generated letters may only be used to document service for the currently assigned vessel or unit, provided it is signed by the commanding officer. It cannot provide past sea service and vessel information.


Sea service MAY be creditable for up to approximately 70 percent (60 percent plus 25 percent of time assigned to vessel other than while underway) of time served onboard vessels, provided your service started prior to March 24, 2014. If service is after March 24, 2014, it will be credited at 60 percent.


Individuals who have the qualifying service as indicated above are eligible for this consideration regardless of present status. Therefore, active duty members, reservists, retirees, recently separated personnel, and civilian mariners with qualifying service on uniformed service vessels are eligible to be considered under these provisions.


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