U.S. Army Gen. Frank J. Grass, chief of the National Guard Bureau and a member of the Joint Chiefs of Staff, speaks with a representative of South Carolina Helicopter Aquatic Rescue Team (SC-HART) during a simulated rescue operation during Vigilant Guard South Carolina at Hobcaw, S.C., March 9, 2015. 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 Airman 1st Class Ashleigh S. Pavelek/Released)