The 369th Infantry Regiment, formerly known as the 15th New York National Guard Regiment, was an infantry regiment of the New York Army National Guard during World War I and World War II. The Regiment consisted mainly of African Americans, though it also included a number of Puerto Rican Americans during World War II. It was known for being the first African American regiment to serve with the American Expeditionary Forces during World War I. The regiment was nicknamed the Harlem Hellfighters, the Black Rattlers. The nickname "Hell Fighters" was given to them by the Germans due to their toughness and that they never lost a man through capture, lost a trench or a foot of ground to the enemy.