I gave Eskin Kuhn a surprise phone call this morning. His response (what he said and how he said it) confirmed that his account of the 1971 sighting at Guantanamo Bay, Cuba, was no hoax; I have no doubt that he saw what he said that he saw: two long-tailed pterosaurs flying in daylight.
Rather than repeat the entire “Out of place artifacts” web page (Kuhn told me that he had nothing to add or modify from his previous interview-comments and cryptid-descriptions), consider some excerpts:
“I was [stationed] . . . [to the] 8th Regiment (reinforced), H&S Co., 106mm recoiless rifle platoon . . . I had been in Cuba for perhaps 4 months  . . . [during] a free time period, in the middle of the day . . . I was outside and witnessed the Pterosaurs.
” . . . most of the platoon was in the new barracks . . . I was looking in the direction of the ocean when I saw an incredible sight . . . I saw 2 Pterosaurs (or Pterodactyls…what’s in a name?) flying together at low altitude, perhaps 100 feet . . . I had a perfectly clear view of them. The rythym of their large wings was very graceful, slow ; and yet they were flying and not merely gliding . . . The Pterosaurs I saw had the short hind legs attached to the rearwardmost part of the wing, and they had a long tail trailing behind with a tuft of hair at the end. The head was disproportionately large, with a long crest at the back, long bill, long neck with a crook in it . . . The vertebrae of their backs was noticeable, mostly between the shoulders. I would estimate their wingspan to be roughly 10 feet . . . They came in from the direction of the sea and flew inland.”
The many details that Kuhn gave in his original desciption make it obvious that the creature had no feathers; his sketches also make this obvious. His composure of speech, during his phone conversation with me, was compelling: He is telling the truth.