South Carolina National Guard units worked with local emergency management agencies and first responders during a mass casualty exercise (MASCAL) in Anderson, S.C., March 10, 2015, which simulated a hard landing by a CH-47 Chinook as a result of rough weather as part of Vigilant Guard. Vigilant Guard SC 15 is an eight-day field exercise held March 5-12. VG-15 takes place at numerous locations across South Carolina as the National Guard and its local and federal partners test their response readiness and capabilities to a simulated hurricane. (U.S. Army National Guard photo by Staff Sgt. Roberto Di Giovine/Released)