Airman 1st Class Colin Glennen, 74th Aircraft Maintenance Unit (AMU) crew chief, disconnects a liquid oxygen (LOX) tank from a truck Nov. 14, 2019, at Moody Air Force Base, Ga. LOX is used as a continuous supply of breathable air to pilots and aircrew at high altitudes. The 74th AMU crew chiefs are responsible for servicing LOX systems on the A-10C Thunderbolt II. (U.S. Air Force photo by Airman Azaria E. Foster)