Final answer:
The U.S. Department of Health & Human Services and the American Cancer Society are the two organizations most recognized for their screening programs, which are crucial for disease prevention and early detection.
Step-by-step explanation:
The two most widely recognized screening programs are those put forth by the U.S. Department of Health & Human Services--Office of the Assistant Secretary for Planning and Evaluation, and the American Cancer Society. These organizations lead in the implementation and development of screening programs or guidelines that help in the early detection and prevention of various diseases, like cancer. The U.S. Department of Health & Human Services is deeply involved in health policy and planning, while the American Cancer Society is focused on cancer prevention, research, and raising public awareness about the disease.