NVGs
Airman 1st Class Tyler Shepherd, 2nd Operations Support Squadron aircrew flight equipment apprentice prepares to calibrate a pair of AN/AVS-9 night vision goggles by looking through a Hoffman 20/20 machine 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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