G.I. - Wikipedia
https://en.wikipedia.org/wiki/G.I.
G.I. are initials used to describe the soldiers of the United States Army and airmen of the United States Air Force and general items of their equipment. The term G.I. has been used as an initialism of "Government Issue," "General Issue," or "Ground Infantry," but it originally referred to "galvanized iron," as used by the logistics services of the United States Armed Forces.
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