All functions, responsibilities, authorities, and duties of the Department of the Interior, the Bureau of Indian Affairs, Secretary of the Interior, and the Commissioner of Indian Affairs relating to the maintenance and operation of hospital and health facilities for Indians, and the conservation of the health of Indians, are transferred to, and shall be administered by, the Surgeon General of the United States Public Health Service, under the supervision and direction of the Secretary of Health and Human Services: Provided, That hospitals now in operation for a specific tribe or tribes of Indians shall not be closed prior to July 1, 1956, without the consent of the governing body of the tribe or its organized council.