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A naval rating is an enlisted member of a country's navy, subordinate to warrant officers and officers hence not conferred by commission or warrant. The naval term comes from the general nautical usage of rating - a seaman's class or grade as recorded in the ship's books,[

In short, two rules: a general pride in one's military specialty and pay grade-generally attractively represented by a good lookin' uniform insignia; and "if it ain't broke don't fix it!" Military personnel take pride in their 'rating' the system adapted from the British works...( jus' dandy for 241 years!) just fine; no need to alter it. Every service branch has its culture and tradition; often a source of enlistment incentive-none more so than the US Navy. https://en.wikipedia.org/wiki/List_of_United_States_Navy_ratings