U.S. Air Force Staff Sgt. Jacob Wade, 52nd Operations Support Squadron non-commissioned officer in charge of aircrew flight equipment quality assurance, center right, demonstrates the use of a joint combined aircrew system tester training system at the 21st tactical air base in April 2021. JCASTs are used to equip aircrew with the right amount of oxygen needed to keep flying in the event of high altitudes. (Courtesy Photo)