In conclusion the OS is an entry level apprentice rating. While the AB is a journeyman rating. In contrast, holding a Master or Mate does not qualify you as an AB. Your MMC must say AB to work as a deckhand on seagoing vessels 100 GRT and greater. The biggest mistake that a mariner can make is NOT getting an AB. The result being that too many career opportunities are missed without it.
mmc
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Frequently Asked Questions
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