Official record
The signature appeared first as a V, then a W, and finally an M.
A radar crew in Morocco observed a signature that changed shape from V to W to M, then faded.
The event was documented in a 1953 US Air Force intelligence report.
A crew in Morocco reported a radar signature in French North Africa and the Mediterranean Sea area.
What we know
The signature changed between shapes that looked like V, W, and M.
The crew observed the signature for several minutes, then it faded away.
Proposed explanations included an atmospheric phenomenon, interference from a ship's radar, and birds.
The documents, the sources and everything that didn't fit here are in the full article.
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