U.S. Air Force Tech. Sgt. Isis Lovette, 633rd Aerospace Medicine Squadron operations noncommissioned officer in charge, operates the hypobaric chamber for the last time at Langley Air Force Base, Va., Dec. 11, 2014. The 633rd AMDS is set to begin using the more cost-efficient Reduced Oxygen Breathing Device. (U.S. Air Force photo by Airman 1st Class Devin Scott Michaels/Released)