Unfortunately, the services and the civil rights leaders had somewhat different ends in mind. Concerned chiefly with military efficiency but also accustomed to racial segregation or exclusion, most military leaders insisted on a rigid appraisal of the performance of segregated units in the war and ignored the effects of segregation on that performance. Civil rights advocates, on the other hand, seeing an opportunity to use the military as a vehicle for the extension of social justice, stressed the baneful effects of segregation on the black serviceman's morale. They were inclined to ignore the performance of the large segregated units and took issue with the premise that desegregation of the armed forces in advance of the rest of American society would threaten the efficient execution of the services' military mission. Neither group seemed able to appreciate the other's real concerns, and their contradictory conclusions promised a renewal of the discord in their wartime relationship. _Black Demands_ World War II marked the beginning of an important step in the evolution of the civil rights movement. Until then the struggle for racial equality had been sustained chiefly by the "talented tenth," the educated, middle-class black citizens who formed an economic and political alliance with white supporters. Together they fought to (p. 124) improve the racial situation with some success in the courts, but with little progress in the executive branch and still less in the legislative. The efforts of men like W. E. B. DuBois, Walter White, and Thurgood Marshall of the NAACP and Lester Granger of the National Urban League were in the mainstream of the American reform movement, which stressed an orderly petitioning of government for a redress of grievances.