In his new book, The Double V: How Wars, Protest and Harry Truman Desegregated America’s Military, author Rawn James Jr. argues that if one wants to understand the story of race in the United States, one must understand the history of African-Americans in the country’s military. Since the country was founded, he tells Fresh Air’s Dave Davies, the military “has continually been forced to confront what it means to segregate individuals according to race.”