UFO Sighting in Lajes, Praia da Vitória, Ilha de Terceira on June 15th 1989 - Observed as a possible silver diamond in shape approximately 10,000+ feet high

I was lolling on the beach and observed a pulse jet, diamond shape aircraft/UFO traveling rapidly overhead. Object went from horizon to horizon in approximately 2 or less minutes. Observed through binoculars. I have spent 42 years working for the US Dept of Defense and never witnessed anything travel so fast. I do not think it was the SR-71 as it is not a pulse jet and they do not fly as fast as this observation. I lost sight of the object when it went over to the western horizon.

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