LANGLEY AIR FORCE BASE, Va. -- Emergency crews load patients with mock injuries into the back of an ambulance, after being triaged at the scene of a simulated explosion during a Major Accident Response Exercise Feb. 4. MAREs are held on a semi-annual basis to ensure emergency responders are trained and able to handle real-world incidents. (U.S. Air Force photo / Senior Airman Wesley Farnsworth) (RELEASED)