http://www.duboislc.org/BlackPerspective/BlackPerspectivePart16.html
"A total of 1,154,720 Negroes were inducted or drafted into the armed services." At first the approximate one hundred thousand who saw duty in the navy had to contend with the old policy of "messmen only," but after considerable agitation the Black enlistees were used for general services.
The Air Corps (then part of the army) maintained strictly segregated units. However, they did train Black pilots, and the all Black squadron trained at Tuskegee (who became known as the "red Tails") compiled "an exceptional total of 'kills'." The other Black squadrons, organized later, also established impressive records.
"Most Negro troops in Europe were in the Quartermaster Corps, as they had been in World War I. And in the task of servicing the fighting fronts, Negro Units performed prodigies of stevedoring, trucking, wire-laying, beach-clearing, and evacuation of the wounded. Some forty thousand Negroes were the majority of the men who formed the amazing 'Red Ball Express', a truck supply route in Europe that ran from the ports and beaches right up to the front lines. Bumper to bumper, in any weather, under strafing and shelling, the Red Ball trucks went through night and day. Disabled trucks were pushed off the road (which was five times as long as the famed Burma Road), but the Red Ball Express kept moving—a feat that amazed the military commanders of all nations and a vital, if not the vital, key to Allied victories in Europe. On top of this, when the Red Ball men delivered their supplies, they often picked up rifles and fought. At Bastogne, Belgium, during the Battle of the Bulge, the Red Ball Express rolled into the beleaguered American pocket as German forces closed in behind them. After distributing their supplies, the truck drivers grabbed weapons and helped the 101st Airborne Division make its legendary stand against the last German offensive of the war."
They were there, but it looks like the only did a tiny percentage of the actual fighting. Much like the 51st in the Civil War, under Mathew Broderick.