The First Special Service Force was a joint American-Canadian military unit formed during World War II. Established in 1942, it was designed for unconventional warfare, specializing in tasks such as reconnaissance, sabotage, and direct assaults. The unit was known for its elite training and distinctive black berets, earning the nickname "The Devil's Brigade." The Force played a significant role in several key operations, including the invasion of Italy and the liberation of Southern France. Its success in challenging terrains and harsh conditions set a precedent for future special operations forces, influencing the development of modern units like the U.S. Army Rangers and Canadian Special Operations Forces.