Master Maintenance Air Force Master Sgt. Bill Richey prepares to wash the back of a C-17 Globemaster III at Pittsburgh International Airport Air Reserve Station, Penn., Aug. 19, 2020. SHARE: Download: Full Size (1.08 MB) Tags: Air Force Credit: Joshua Seybert, Air Force VIRIN: 200819-F-UJ876-3127M.JPG Photo Gallery