U.S. Air Force Staff Sgt. Kevin Shoultz, 35th Maintenance Squadron precision measurement equipment laboratory electrical standards element supervisor, calibrates, in a dark room, a night vision test set to make sure night vision goggles are operational at Misawa Air Base, Japan, July 3, 2012. The test conducts operational checks for equipment use by pilots and security forces Airmen during night operations. (U.S. Air Force photo/Airman 1st Class Kenna Jackson/Released)
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