By 1945, America's losses of troops were affecting them so much that they had forced the military to start placing African American troops into positions like soliders, cooks, nurses, etc.
Although they were placed into a harsh enviroment, all of them had done their job with honor and pride like any other. Their enthusiasm was a way to show that African Americans deserved greater rights (as racism wasn't fully solved at the time.)
During that, the Double V movement was also taking place. It standed for "Victory Abroad and Victory at Home".
It's purpose was to promote the fight for democracy overseas (Victory Abroad) and demand equality for African Americans (Victory at Home).
Although racism hadn't fully ended, it was impactful anyway. The movement was basically the opening salvo in the Civil Rights Movement.
White people had also began accepting African Americans into society as they had helped in the war.
Not only that, but after the year-long campaign, it brought African American's together with a bond and embraced the effort of Black Americans.
So, the effort made into the war from black people was a changing point in society.