Who serves in the military?

I wonder how the rumor got started that an all volunteer military would disproportionately attract poor and minority? Isn't true. Blacks and white are about proportionate to the population, Hispanics underrepresented, Indians overrepresented. Higher level of education than the general population. "U.S. military enlistees disproportionately come from upper-middle-class families. Members of America's volunteer Army are not enlisting because they have no other economic opportunities. Most recruits come from relatively affluent families and would likely earn above-average wages if they did not join the military." http://www.heritage.org/…/who-serves-in-the-us-military-the…