Staff Sgt. Nathan Melazzo, 355th Civil Engineer Squadron explosive ordinance disposal, teaches Airmen on the different versions of night vision goggles and how to use them during a night training exercise at Davis-Monthan Air Force Base, Ariz., August 16. With NVGs on the user can clearly see in the dark, but their depth perception is affected. (U.S. Air Force photo by Airman 1st Class Michael Washburn/Released)
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