U.S. Air Force Airman 1st Class Jasper Walker, 860th Aircraft Maintenance Squadron integrated flight system control journeyman, looks over paperwork while inside a C-17 Globemaster III Sept. 9, 2020 at Travis Air Force Base, California. Wildfires across California propelled smoke and ash into the troposphere, impacting air quality. (U.S. Air Force photo by Heide Couch)