The Commissioned Corps is a group of public health professionals who serve in various federal agencies, primarily under the U.S. Department of Health and Human Services. Members are appointed as officers and work to protect and promote the nation's health, responding to public health emergencies and providing health services in underserved areas. Commissioned Corps officers come from diverse fields, including medicine, nursing, and environmental health. They play a vital role in initiatives like disease prevention, health education, and disaster response, often collaborating with other federal agencies, such as the Centers for Disease Control and Prevention (CDC) and the National Institutes of Health (NIH).