Military veterans account for 7% of the adult population of the United States, according to a report released by the U.S. Census Bureau last year. NPR looked into the backgrounds of those charged so far in the violent Capitol attack last month by supporters of then-President Donald Trump and found that nearly 20% are veterans — meaning those who have served in the military were nearly three times more likely than non-veterans to have been involved, despite having taken an oath to defend the Constitution.