Not for our kind of people?

This article in the Post-Gazette struck me:

Staff Sgt. Jason Rivera, 26, a Marine recruiter in Pittsburgh, went to the home of a high school student who had expressed interest in joining the Marine Reserve to talk to his parents.
It was a large home in a well-to-do suburb north of the city. Two American flags adorned the yard. The prospect's mom greeted him wearing an American flag T-shirt.
"I want you to know we support you," she gushed.
Rivera soon reached the limits of her support.
"Military service isn't for our son. It isn't for our kind of people," she told him.

Who then is it for? According to this piece in the U.S. Army War College's periodical, Parameters, demographics may have an answer:

In the civilian sector, the United States and the countries of Western Europe have had to rely on immigrants, some of them illegal, to supply needed younger-age labor when domestic birthrates would not have done so. And the same may again have to be the case in military recruitment, with the past indeed filled with numerous illustrative examples.

As fewer Americans step up to the plate, it's possible we may see an American Foreign Legion.