They were merged to form the Fish and Wildlife Service in 1940. Then in 1956, two bureaus were formed under the U. S. Fish and Wildlife Service—the Bureau of Sport Fisheries and Wildlife (which included the Division of Wildlife Refuges) and the Bureau of Commercial Fisheries. Subsequently, the Bureau of Commercial Fisheries was transferred in 1970 to the Department of Commerce and became the National Marine Fisheries Service, while the Fish and Wildlife Service still remains a bureau of the Department of the Interior.