Sgt. 1st Class Ross Miller, with the 52nd Civil Support Team, Ohio National Guard, renders first-aid July 30 to Paul Hanson, a simulated casualty, during Vibrant Response 13-2 held at Muscatatuck Urban Training Center, Ind. VR 13-2 is a major incident exercise conducted by U.S. Northern Command and led by U.S. Army North (Fifth Army), which is based out of Fort Sam Houston, Texas. It is a field training and command post exercise designed to test the capabilities of the Department of Defense's ability to respond to a chemical, biological, radiological or nuclear event.