U.S. Air Force Airmen from the 633rd Aerospace Medicine Squadron help operate the hypobaric chamber for the last time before implementing use of the new Reduced Oxygen Breathing Devices at Langley Air Force Base, Va., Dec. 11, 2014. The new system will require less technicians to train students, saving time and money. (U.S. Air Force photo by Airman 1st Class Devin Scott Michaels/Released)