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During WWI the Marines fought with such ferocity and valor that they were called GI's. A marine doesnt want to be called a GI he wants to be called a Marine so they mixed the two to for Gyrene (GI-Marine)

Marines Kick Ass
"Hey did you see how well those Gyrenes fought today"
by M-A-R-I-N-E October 09, 2006
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