1 From the Uniformed Service University of Health Sciences (T.M.P., J.M.G., J.W.C., A.P.C., P.A.F.), Bethesda; DoD Combat Casualty Care Research Program (T.M.P.), US Army Medical Research and Development Command, Fort Detrick, Maryland; Joint Trauma System (J.M.G.), DoD Center of Excellence for Trauma, Joint Base San Antonio-Fort Sam Houston, Texas; Armed Services Blood Program (L.E.R.), Defense Health Headquarters, Falls Church, Virginia; Division of Traumatology, Surgical Critical Care and Emergency Surgery (J.W.C.), Perelman School of Medicine at the University of Pennsylvania, Philadelphia, Pennsylvania; US Army Institute of Surgical Research (A.P.C.), US Army Medical Research and Development Command, Joint Base San Antonio-Fort Sam Houston, Texas; and Office of the Joint Staff Surgeon (P.A.F.), Washington, DC.