U.S. Air Force Master Sgt. Rebecca Tongen (right), 145th Civil Engineer Squadron, speaks with members of the 145th Aircraft Maintenance Squadron prior to the start of the Triennial National Disaster Medical Systems (NDMS) Exercise held at the Charlotte-Douglas International Airport, N.C., Oct. 8, 2017. A C-130 Hercules aircraft was utilized during the NDMS exercise to simulate an aircraft accident. The exercise goal is to demonstrate the ability to alert, notify, and respond to an aircraft accident utilizing and communicating between various organizations to ultimately recover and render medical aid to victims.