Just like the civilian world, the military needs people to be Janitors as well as Nuke Operators... It takes all kinds to make the world go round. There are probably at least a few people with decent enough intelligence (aptitude) but with little or no direction, or ability to finish HS get a GED that this might open some doors for, or allow them to 'get out' of their current situation. Maybe learn a new skill, get some education where otherwise they may have just floundered. Or they could just be cannon fodder :-/

It will be interesting to see how this works out.