The U.S. Department of Health and Human Services (HHS) - Office of Population Affairs (OPA) is responsible for promoting and improving the overall health of the U.S. population. OPA focuses on reproductive health, family planning, and adolescent health. Their main goals include providing access to family planning services, promoting responsible parenthood, preventing unintended pregnancies, and supporting healthy adolescence. OPA also oversees grant programs and provides resources and guidelines to healthcare providers and organizations in order to achieve these objectives.