U.S. Air Force Staff Sgt. Andrew Hall, 4th Equipment Maintenance Squadron avionics back shop support team lead (right), explains to U.S. Air Force Gen. Mark Kelly, commander of Air Combat Command (center), the innovative changes the 4 EMS is making at Seymour Johnson Air Force Base, North Carolina, Dec. 17, 2020. The 4 EMS Airmen have developed a method to test and repair leaks in the stab actuator of an F-15E Strike Eagle rather than sending the component to be remanufactured. (U.S. Air Force photo by Senior Airman Jacob Derry)