Maj. David Ferguson, medical crew director with the 315th Airlift Wing based out of Joint Base Charleston, S.C., directs the offloading of a simulated litter patient during a multi-agency patient evacuation exercise held at the base and in Greenville, S.C., May 14, 2014. The exercise was organized through the National Disaster Medical System, which coordinates several federal, state and local emergency response agencies in times of national disaster and mass casualty. (U.S. Air Force photo by Senior Airman Meredith A. H. Thomas)