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Has he said what his motivations are for wanting to join the military?
Unless things have changed recently, the Marine Corps has a cap of no more than 5% of new recruits in a year being high school drop outs (this includes both no degree and GED).
Since the number of applications in this category generally exceed your physical fitness and ASVAB scores generally need to be much higher than average. It'll also limit his education and occupational choices.
If he does have a GED, then taking 15 college credits will get him bumped into the same category as regular high school graduates.
If he really wants to be a Marine (and isn't just viewing it as an immediate escape route) the best path really is to complete high school.
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