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Airman 1st Class Erich Held demonstrates how pilots would use the Reduced Oxygen Breathing Device Feb. 5, 2014, at Joint Base Lewis-McChord, Wash. The ROBD is combined with a flight simulator that can change its display to match specific aircraft each training pilot flies. Held is a 62nd Medical Squadron optometry technician. (U.S. Air Force photo/Tech. Sgt. Sean Tobin)

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Photo by: Tech. Sgt. Sean Tobin |  VIRIN: 140205-F-KG812-003.JPG