The USMC opened its doors to blacks in June 1942, with the acceptance of African Americans as recruits in segregated all-black units. Other races were accepted somewhat more easily, joining white Marine units. For the next few decades, the incorporation of black troops was not widely accepted within the Corps, nor was desegregation smoothly or quickly achieved. Spurred by executive orders in 1941 and 1948, the integration of non-white USMC personnel proceeded in stages from segregated battalions in 1942, to unified training in 1949, and finally full integration in 1960.