The 339th Infantry Regiment was among the first American units to arrive in Europe during World War I. Its members fought in at least one major battle and spent more time in the front lines than any other American unit. Men in the regiment were awarded over 100 decorations. The Germans called the regiment the Hell Fighters because of the ferocity of its men in battle. What was the significance of the Harlem Hell Fighters during World War I? A. They were the only American regiment to go into combat with African American officers. B. They proved that African Americans could perform in combat as well as white American troops. C. They were the only American regiment that was made up mainly of African Americans. D. They proved that African Americans could fight using advanced military technology.