The Radiation Injury Treatment Network® (RITN) is a national network of medical centers with expertise in the management of bone marrow failure and works with partners from other medical specialties to assist with managing acute radiation syndrome (ARS) and its health-related consequences. The mission of the RITN is to maximize health-related outcomes among casualties with ARS following a mass casualty disaster involving radiological, nuclear, or chemical agents with marrow toxicity. RITN is led by the National Marrow Donor Program and American Society for Transplantation and Cellular Therapy, with essential support from the US Office of Naval Research. For more information, please see our website www.ritn.net.