Purging line

Senior Airman Richard Sharpe, a student from McGuire Air Force Base, N.J., purges a line from a liquid nitrogen tank as 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. (U.S. Air Force photo by John Ingle)

PHOTO BY: John Ingle
VIRIN: 060726-F-2316I-025.JPG
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