I went to highschool and university in the US - I was lucky that I got a scholarship and that covered pretty much all my tuition costs.

But I had a friend, one year older than me, who joined and served in the US army for something like 2 years just so he could get his university costs covered and to save some money for living expenses.

It may not be intentional, but the high cost of higher education is an excellent recruiting tool for the US military.