Spc. Phillip Lark, 204th Military Intelligence Battalion cryptologic linguist, waits in the chamber for a safety briefing on Nov. 23, 2020, Laughlin Air Force Base, Texas. The brief guides members through what to do if they begin suffering from hypoxia -- A lower-than-normal concentration of oxygen in arterial blood. (U.S. Air Force photo by Airman 1st Class David Phaff)