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Senior Airman James McMillan replaces the seal on a pair of night vision goggles after replacing the nitrogen during an inspection Sept. 1, 2010, on Joint Base Charleston, S.C. The nitrogen helps amplify any available light allowing Airmen to operate or fly in extremely low light environments. The nitrogen also acts as a gas lubricant allowing the internal parts to move freely. The NVGs are inspected before and after flight and after 180 days. Airman McMillan is a NVG technician with the 437th Operations Support Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)
100901-F-6448T-139.JPG Photo By: Unknown

Senior Airman James McMillan replaces the seal on a pair of night vision goggles after replacing the nitrogen during an inspection Sept. 1, 2010, on Joint Base Charleston, S.C. The nitrogen helps amplify any available light allowing Airmen to operate or fly in extremely low light environments. The nitrogen also acts as a gas lubricant allowing the internal parts to move freely. The NVGs are inspected before and after flight and after 180 days. Airman McMillan is a NVG technician with the 437th Operations Support Squadron. (U.S. Air Force photo/Senior Airman Timothy Taylor)


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