Desegregation occurred in the US military after the end of World War II, during Truman's presidency, with the issue of the Executive Order No. 9981.
The Executive Order No. 9981 is an executive order of US President Harry S. Truman dated July 26, 1948, which grants equal treatment and equal opportunities to all members of the United States Armed Forces, regardless of race, color, religion, or national origin.
The presidential directive was received by the African American community as the end of racial segregation in the armed forces and is still considered an important step towards abolishing racial discrimination.