I have a friend who's brother is a full-time student in college and also is active in the navy (I think it's the navy if memory serves me correctly). I don't know if they still offer this or not but that's another option. You could go to basic during your semester off and then come back and be a full time student until you finished while you were enlisted. Again, I'm not sure of the details or if they even do this anymore but I know it's been done before.
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Russ
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"The difference between a successful person and others is not a lack of strength, not a lack of knowledge, but rather a lack of will." Vince Lombardi