Maintaining aircrew equipment
Airman 1st Class Jason Konrad, 2nd Operations Support Squadron aircrew flight equipment, uses an oxygen mask test unit to test a piece of equipment on Barksdale Air Force Base, La., Jan. 15. The machine is used to test aircrew equipment for leaks and simulates an altitude of up to 48,000 feet. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)