M61A1 Vulcan cannon - Staff Sgt. Douglas Brown looks through a boresight telescope on an F-16 Fighting Falcon trainer to make sure the M61A1 Vulcan cannon barrels are correctly aligned at Misawa Air Base, Japan, July 2, 2012. As Brown watched the crosshairs of the scope, he instructed another Airman to move a collimator so the weapon alignment was accurate. Brown is a 35th Aircraft Maintenance Squadron resource advisor. (U.S. Air Force photo by Airman 1st Class Kia Atkins)
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