Aircrew flight equipment: no masking safety
U.S. Air Force Staff Sgt. Jonathan McCullough, an 8th Operations Support Squadron aircrew flight equipment (AFE) journeyman assigned to Kunsan Air Base, Republic of Korea, performs maintenance on an oxygen mask, May 2, 2016, at Eielson Air Force Base, Alaska. AFE technicians must perform extensive work on each piece of equipment to ensure maximum safety for pilots. (U.S. Air Force photo by Staff Sgt. Ashley Nicole Taylor/Released)