Dan, another consideration is the educational assistance that's available thru the National Guard.  Admittedly, I'm pretty prejudiced, but it is a terrific opportunity for the right people.  I snagged this link:  http://www.petersons.com/ off the Iowa National Guard website.  It is not a military-specific source, it's a site with multiple scholarship links and maybe one or more of them will have something that your son is eligible for.