Staff Sgt. Wilfredo Vargas, 911th Maintenance Squadron aerospace propulsion technician, inspects a C-17 Globemaster III engine during a home station check at the Pittsburgh International Airport Air Reserve Station, Pennsylvania, July 20, 2020. C-17s are thoroughly inspected for mission and operational readiness during HSC inspections. (U.S. Air Force photo by Joshua J. Seybert)