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Airman 1st Class Tyler Shepherd, 2nd Operations Support Squadron aircrew flight equipment apprentice looks through a Hoffman 20/20 machine  wearing a pair of AN/AVS-9 night vision goggles on Barksdale Air Force Base, La., June 21. The Hoffman is used to calibrate the NVGs to the pilot's eyesight. This process is done in the dark to protect the image intensifier inside the goggles. (U.S. Air Force photo/Senior Airman La'Shanette V. Garrett)(RELEASED)


NVGs

Airman 1st Class Tyler Shepherd, 2nd Operations Support Squadron aircrew flight equipment apprentice looks through a Hoffman 20/20 machine wearing a pair of AN/AVS-9 night vision goggles on Barksdale Air Force Base, La., June 21. The Hoffman is used to calibrate the NVGs to the pilot's eyesight. This process is done in the dark to protect the image intensifier inside the goggles. (U.S. Air Force photo/Senior Airman La'Shanette V. Garrett)(RELEASED)

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