Being in great swimming, running, and gerneral calesthenics shape. Such as pushups, pullups, flutter kicks, situps.
And an attitude that will never let you quit.
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A high school degree or equivalency, 30 or higher in all categories of the ASVAB, no prior felony convictions, be over 18 or have parental permission at 17 to enlist after you graduate, pass the MEPS...