Staff Sgt. Adam Heckmann (right) and Master Sgt. Michael Wilson (left) service the liquid oxygen on an F-15 Eagle on Nellis Air Force Base, Nevada Jan. 19, 2017. The liquid oxygen converts from liquid to gas to supply the pilot with breathable air. (Air National Guard photo by Master Sgt. William J. Buchanan/Released)

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Photo credit: © AB Forces News Collection / Alamy / Afripics
License: Licensed
Model Released: No

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