Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Public Health Service Act structured the United States Public Health Service (PHS) as the primary division of the Department of Health Education and Welfare (HEW), which later became the United States Department of Health and Human Services. The PHS comprises all Agency Divisions of Health and Human Services and the Commissioned Corps. The Assistant Secretary for Health (ASH) oversees the PHS and the United States Public Health Service Commissioned Corps.