Air Force Staff Sgt. Joseph Olejniczak, right, shows Airman 1st Class Michael Tipton how to purge a liquid oxygen line before filling a container for transport at Seymour Johnson Air Force Base, , Jan. 5, 2010. Olejniczak is a terminal operations technician and Tipton is a distribution technician. Both Airmen are assigned to the 4th Logistic Readiness Squadron. Airman 1st Class Rae Perry, Air Force

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Photo credit: © PJF Military Collection / Alamy / Afripics
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