The image was first used in connection with the Nimitz incident in this 2015 article:
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It was used in the original "To The Stars" presentation by Chris Mellon
The image was also used today by George Knapp in a piece on LasVegasNow
However this "UFO" image is in fact of a mylar party balloon. It comes from this Rense.com page dated 2005:
This object, and the described motion, is a perfect match for a mylar party balloon in the shape of a "1", a common digit in party celebrations.