U.S. Air Force Staff Sgt. Douglas Fields and Staff Sgt. Zachary Zistl work on an F-22 Raptor at Joint Base Langley-Eustis, Virginia, May 21, 2021. Crew chiefs provide repair and overhaul capabilities for egress, fuels, armament, structural and low observable systems. (U.S. Air Force photo by Senior Airman Alexandra Singer)