Senior Airman Kenny Batallas, 374th Operations Support Squadron Aircrew Flight Equipment flight technician, performs an operations check on a new quick-dawn oxygen mask Jan. 25, 2017, at Yokota Air Base, Japan. Operations checks are performed by the 374th AFE flight regularly on every piece of aircrew life-support and survival item to ensure everything functions as required. (U.S. Air Force photo by Airman 1st Class Donald Hudson)