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Major Nikon

(36,925 posts)
6. The only thing "mysterious" about it is the USAF refuses to officially release details about it
Wed Dec 11, 2013, 07:48 PM
Dec 2013

X designations have been used for military test aircraft since WWII at least. A quick google search reveals all sorts of pictures. The wiki entry lists specifications, launch dates, and amateur tracks of the aircraft.

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