Like the National Commission and the President's Commission, the Advisory Committee on Human Radiation Experiments was formed to carry out specific ethical tasks. Yet the committee also had an “openness” mission, a charge to investigate allegations that the U.S. government secretly exposed Americans to environmental releases of radiation. Eighteen months later—and after sixteen public meetings, more than 200 interviews, and the review of about 400,000 documents—the committee delivered a 925‐page report to the president.