Globemaster Care Air Force Staff Sgt. Sean Tkacsik loosens a bolt while replacing lines on a C-17 Globemaster III engine at the Pittsburgh International Airport Air Reserve Station, April 14, 2020. SHARE IMAGE: Download Image: Full Size (0.68 MB) Tags: Air Force Photo By: Joshua Seybert, Air Force VIRIN: 200414-F-UJ876-1046C.JPG Photo Gallery