Dr. David Calloway (left), director of the Carolinas

Dr. David Calloway (left), director of the Carolinas Med-1 facility, briefs U.S. Army Gen. Frank Grass, the Chief of the National Guard Bureau and a member of the Joint Chiefs of Staff (right), while he visits the Carolinas Med-1 facility during a tour of Vigilant Guard South Carolina activities March 9, 2015, at the Georgetown Airport in Georgetown, S.C. Vigilant Guard is a series of federally funded disaster-response drills conducted by National Guard units working with federal, state and local emergency management agencies and first responders. (U.S. Air National Guard photo by Amn Megan Floyd/Released)