140903-F-LO037-071
Senior Airman Seth Bruning fills a liquid oxygen tank on Ramstein Air Base, Germany, Sept. 3, 2014. Cryogenics receive, store, maintain and issue liquid oxygen and liquid nitrogen to aircrafts so the aircrew can breathe while at higher altitudes. Bruning is a hydrants technician with the 86th Logistics Readiness Squadron. (U.S. Air Force photo/Airman 1st Class Michael Stuart)