Joint Base Charleston fire fighters approach simulated crash aircraft remains during a Major Accident Response Exercise March 22, 2011 on Joint Base Charleston S.C. The MARE is a necessary step to prepare all Joint Base Charleston members for the upcoming 2011 Air Expo . The exercise is used to help test and train the supporting agencies who would respond in case of an emergency. Captain Ellis-Yarian is a flight surgeon with the 628th Medical Group. (U.S. Air Force photo/ Staff Sgt. Nicole Mickle) (Released)