Negative Pressure The Negative Pressure CONEX-Light rests between C-17 and HC-130J aircraft at Joint Base Charleston, S.C., June 13, 2020. SHARE IMAGE: Download Image: Full Size (0.27 MB) Photo By: Courtesy of Air Force Lt. Col. Paul D. Hendrickson VIRIN: 200613-O-ZZ999-4216C.JPG Photo Gallery