Project Blue Book Case #10535. On May 7, 1966, an unidentified object was observed over Goodfellow Air Force Base in San Angelo, Texas. Goodfellow was the Air Force's primary intelligence and cryptology training center, where personnel learned the classified arts of signals intelligence, imagery analysis, and code-breaking.
The irony of an unidentified object over an intelligence training base was notable — the personnel being trained there would eventually be responsible for analyzing and interpreting intelligence data, yet they could not identify what appeared in their own sky. May 1966 was during the sustained wave. The case was classified "Unknown."