U.S. Air Force emergency responders treat a simulated victim during an active shooter scenario as part of a mission focused exercise on Kadena Air Base, Japan, Dec. 1, 2014. The active shooter exercise was one of many situations Airmen will be thrust into during the MFE, which is slated to run through Dec. 4. (U.S. Air Force photo by Senior Airman Maeson L. Elleman/Released)