Descending Duo Airmen perform a high altitude, low oxygen jump over Washington state, Aug. 7, 2017, during exercise Mobility Guardian. More than 3,000 airmen, soldiers, sailors, Marines and international partners participated in the exercise. Air Force photo by Senior Airman Clayton Cupit SHARE: Download: Full Size (2.08 MB) Credit: Senior Airman Clayton Cupit VIRIN: 170807-F-EV310-0434C.JPG Photo Gallery