Coolest brew in the Air Force
Cold case: While Senior Airman Richard Sharpe, a student from McGuire AFB, N.J., purges a line from a liquid nitrogen tank, Staff Sgt. Richard Hill, a student from Barksdale AFB, La., controls the valves of the tank. Students use liquid nitrogen instead of liquid oxygen for safety purposes during training, because liquid nitrogen is less volatile than liquid oxygen. Liquid oxygen is used in aircraft to provide oxygen to pilots and aircrews at altitudes above 10,000 feet.
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