The majority of the agencies that carry out health spending within the United States are grouped under the Department of Health and Human Services. These include the National Institutes of Health (NIH), the Centers for Disease Control and Prevention (CDC), and the Food and Drug Administration (FDA). Other departments, such as the Department of Defense and the Department of Veterans Affairs, conduct very specific health programs relating to their mission. International health-spending programs fall primarily under the auspices of the State Department or the United States Agency for International Development (USAID), the board of which is chaired by the secretary of state. Other independent federal agencies, such as the Environmental Protection Agency (EPA) and the Peace Corps, also run programs with international health mandates. The United States is a member of several international organizations as well, including the World Health Organization (WHO), the United Nations, and the World Bank, and as such contributes to their budgets also.