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