USAF F15s Encounter a UFO (PDF)
Radio enthusiasts in U.K. picked up a a call made by London Military Air Traffic Control to a crew of F-15s flying out of RAF Lakenheath who were sent to investigate an unknown target they had picked up on radar at 3000 to 4000ft altitude.
The F-15s get a radar lock on the target and make a pass at 17,000ft and then again at 17,700ft.
One pilot was heard to say to another: "Did you see that?" And the other replied:
"Yes, but I don't want to talk about it."
You can download a copy of the radio transmission here.
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