Oxygen, what the body needs

U.S. Air Force Airman 1st Class Richard Hubbard and Senior Airman Nicholas McGinnis, 31st Logistics Readiness Squadron fixed facilities personnel, fill a liquid oxygen tank, April 23, 2015, at Aviano Air Base, Italy. Liquid oxygen is necessary for pilots to breathe while flying at high altitudes. (U.S. Air Force photo by Senior Airman Matthew Lotz/Released)

PHOTO BY: Senior Airman Matthew LotzReleased
VIRIN: 150423-F-AI558-216.JPG
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