On 12 November 1976, Spanish Air Force soldiers guarding the fuel area at Talavera la Real reported an object.

Talavera matters because it is a Spanish air-base intrusion report.
Documented
Two soldiers reported an object near the fuel area
Debated
The identity of the object
Unverified
Extraterrestrial origin
Sources are kept in separate layers: official and contemporary material is documented; secondary UFO literature is treated as debated, not as primary evidence.
Documented source.
Secondary / debated material.