Airmen Aid Airmen assigned to the 60th Aerial Port and 21st Airlift Squadrons push a negatively pressurized conex into a C-17 Globemaster III at Travis Air Force Base, Calif, Aug. 5, 2020. The NPC is certified for use on the C-17 with testing and certification underway for the C-5M Super Galaxy. SHARE IMAGE: Download Image: Full Size (2.63 MB) Photo By: Lan Kim, Air Force VIRIN: 200805-F-SK304-0048M.JPG Photo Gallery