This Memorial Day, we’re remembering the legacy of the WWII era unit, the 6888 Central Postal Directory Battalion. It was the only predominantly Black, all-women’s U.S. military unit to serve overseas, and is also the subject of a recent Netflix movie. Their mission was to sort through a backlog of more than 17 million pieces of mail and to deliver it to war-weary soldiers scattered across Europe, longing for words of encouragement from home.