MCCHORD AIR FORCE BASE, Wash. -- Tech. Sgt. Anthony Scherer, 62nd Operations Support Squadron, uses a collimation bridge placed on top of a night vision test set to ensure a pair of goggles are properly aligned and ready to be issued April 16, 2007 at the aircrew life support section warehouse. (U.S. Air Force photo/Abner Guzman)
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