Staff Sgt. Nathan Knight, 455th Expeditionary Logistics Readiness Squadron cryogenics supervisor, opens a valve on a 400-gallon liquid oxygen tank, Bagram Airfield, Afghanistan, Sept. 14, 2016. Cryogenics Airmen work with liquid nitrogen and liquid oxygen that is stored into aircraft, providing aircrews with pure oxygen at altitude during missions in support of Operation Freedom’s Sentinel. Senior Airman Justyn M. Freeman)

---

Size: 1870px × 1336px
Photo credit: © PJF Military Collection / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., .., 455, 455th, aew, afcent, afghanistan, air, airfield, airforce, bagram, centcom, central, command, elrs, expeditionary, force, forces, freedom, liquid, lox, military, oxygen, resolute, sentinel, states, support, united, usa, usaf, wing