Liquid Oxygen Air Force Tech. Sgt. Corey Briggs, right, and Staff Sgt. Nathan Knight handle a sample of liquid oxygen at Bagram Airfield, Afghanistan, Sept. 14, 2016. Briggs, a cryogenics technician, and Knight, a cryogenics supervisor, are assigned to the 455th Expeditionary Logistics Readiness Squadron. Air Force photo by Senior Airman Justyn M. Freeman SHARE: Download: Full Size (2.84 MB) Tags: afghanistan, air force, airmen Credit: Senior Airman Justyn Freeman VIRIN: 160914-F-RN544-131A.JPG Photo Gallery