In 1968 roughly 30% of American forces in Vietnam in combat roles were conscripts. As that year went on, and college deferments became tougher, more conscripts appeared in the war zone and significantly for the first time, an increasing number, although far from a majority, were from the middle class. So were the dead heading home in the other direction. That proved a pivot point for protests back in the US.
Perhaps, just perhaps, after the latest school shootings in Florida, the middle class are again finding their voice. One can only hope so, for the sake of all their countrymen.