When he turned 17 in December 1956, he enlisted in the United StatesMarine Corps, and served four years as a machine gunner and was discharged in December 1960 as a corporal with the 3rd Marine Division. Part of his time was spent playing golf with Marine Corps officers. He played successfully in Armed Forces golf events in Asia, where one rival was Orville Moody, who would follow Trevino to the PGA Tour in the late 1960s
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