This post is not in disgreement DD, but I do often watch politicians talk in similar vain suggesting that minorities are doing most of the sacrificing.
It certainly makes sense that a number of poor people (of any race) would choose the miltiary as way out and/or up depending how the individual looks at it. I think this can be shown to have been true for many many cultures and throughout history. Perhaps it is a flaw in our human nature, or just the logic that if you don't have to go, many won't. Short of instituting required service, draft, or an extreme threat to existence, etc. (not too popular an idea) it will probably continue to remain a factor.
Round my parts, TV always announces and shows pictures of the soldiers who have lost their life. The vast majority in this state have been white. Not all were poor.
I'm sure that most all of us join in recognizing the service and sacrifice of all our military, regardless of race, sex, religion, financial status, etc.