Sgt. Nelly Morris, a member of Womack Army Medical Center's security force at Fort Bragg, N.C., applies a tourniquet on a simulated casualty as part of "Stop the Bleed" training at the hospital, Dec. 6, 2017. A new app developed by the National Center for Disaster Medicine and Public Health will help bystanders know what to do in a mass casualty event. Army photo by Eve Meinhardt