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In a navy, a rate, rating or bluejacket is a junior enlisted member of that navy who is not a warrant officer or commissioned officer. Depending on the country and navy that uses it, the exact term and the range of ranks that it refers to may vary.
Royal Navy and Commonwealth navies
In the Royal Navy and other navies in the Commonwealth, rate and rating are interchangeably used to refer to an enlisted member of the navy who is ranked below warrant officers and commissioned officers but may include petty officers and chief petty officers.
The term comes from the general nautical usage of rating to refer to a seaman's class or grade as recorded in the ship's books. The system of conferring authority on sailors in the Royal Navy evolved through the recognition of competence: landsman, ordinary seaman, able seaman, through to the appointment of authority as a petty officer.
The general structure now used breaks down into four major groupings:
United States Navy and United States Coast Guard
In the United States Navy, the term bluejacket is used instead to refer enlisted sailors that rank below a chief petty officer. Bluejacket derives itself from an item of clothing that was worn by junior enlisted sailors before 1886. It was used especially when the sailors were deployed ashore as infantry.
The terms rate and rating as used in the U.S. Navy ans U.S. Coast Guard refer to one's pay grade and ones occupation respectively. In the U.S. Navy, an enlisted sailor is most commonly addressed by their rating rather than their rank, unlike in ground-based forces where one's rank is more prominently noted than one's occupation. Thus, while a U.S. soldier may be addressed as something like "Corporal John Doe", a U.S. sailor or Coast Guardsman is often addressed as something like "Boatswain's mate Jane Smith". If not addressed by rating, the correct form of address for pay grades E-4 through E-6 would be "Petty Officer Jane Smith". Pay grades E-7, E-8, and E-9 are correctly addressed as "Chief", "Senior Chief", or "Master Chief". If pay grades E-3 and below do not have a rating and are sometimes referred to as "non-rates", and addressed by their rank or their last name; i.e. "Seaman Jones" or "Jones".
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