This does not surprise me. We have the richest families in America with their kids in the military. You have the McCains, Bidens, Palins, Hunters, etc. I think this should be known to everyone.
In my town, we would be considered middle to upper middle class, we have lots of yellow ribbons and Blue Star Flags hanging in windows.
The 4 young men that I know currently serving are all 4 yr. college grads who joined the Marines after school.