A member of the United States Marine Corps (slang term).
Slang term of unclear origin, possibly derived from 'gyration' or as a variant of an older military slang term. Used informally within military communities since at least the early 20th century.
Gyrene is insider Marine Corps slang—Marines might call themselves gyrenes, though the term is less common today, and it represents the kind of self-referential humor that military groups use to build identity.
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