Maj. Gen. Richard Scobee, 10th Air Force commander, left, goes through a leak check helped by Senior Airman Jacob Tittle, right, 7th Operations Support Squadron aircrew flight equipment specialist at Dyess Air Force Base, Texas, Feb. 10, 2017. Leak tests are to ensure the mask is fitted properly to sustain ascending and descending pressure while flying. (U.S. Air Force photo by Airman 1st Class April Lancto)