From what I can tell, the military services are chuck full of high school graduates and the very young (18-20 or so), and the very few college graduates in the officer corps.
There is, however, real statistical data that refutes "what you can tell".
The demographics of the Army closely parallel the demographics of the country at large -- by race, education, income level, etc.
People like Cong. Charles Rangel -- who's been pushing for a draft -- are responsible for the notion that the demographics of the armed services are skewed toward the poor and uneducated. But...it's...just...not...true.
OK, I’m willing to be educated. Show me that statistical data that refuses what I noted.