U.S. Air Force Airman 1st Class Christopher Garrison, an F-16C Fighting Falcon aircraft crew chief assigned to the 177th Aircraft Maintenance Squadron, New Jersey Air National Guard, performs liquid oxygen servicing at Atlantic City Air National Guard Base, N.J., Nov. 6, 2013.
The liquid oxygen was used primarily as breathing oxygen for aviators. (DoD photo by Tech. Sgt. Matt Hecht, U.S. Air National Guard/Released). Original public domain image from Flickr