LANGLEY AIR FORCE BASE, Va. -- Staff Sgt. Joseph Dunn and Senior Airman Ryan Gross, 633d Civil Engineer Squadron Fire Department firefighters, carry Airman 1st Class Seth Dillinger, 633d Medical Group Pharmacy technician, away from the scene of a simulated explosion during a Major Accident Response Feb. 4. MAREs are held on a semi-annual basis to certify and train emergency responders on the skills needed to perform efficiently should an actual incident occur. (U.S. Air Force photo / Senior Airman Wesley Farnsworth) (RELEASED)