The object in the famous Calvine UFO picture is likely an extraterrestrial craft. Otherwise, the UK Military of Defence should have no problem identifying it as a secret military craft because the event happened 33 years ago. If it was an experimental craft, the technology by this point is antiquated. Also, invisibility technology employed by extraterrestrials is discussed.

Links/Sources:

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Extraterrestrial Reality book recommendations:

Link to ROSWELL: THE ULTIMATE COLD CASE: CLOSED: https://amzn.to/3O2loSI

Link to COMMUNION by Whitley Strieber: https://amzn.to/3xuPGqi

Link to THE THREAT by David M. Jacobs: https://amzn.to/3Lk52nj

Link to TOP SECRET/MAJIC by Stanton Friedman: https://amzn.to/3xvidfv

Link to NEED TO KNOW by Timothy Good:  https://amzn.to/3BNftfT

Link to UFOS AND THE NATIONAL SECURITY STATE, VOLUME 1:  https://amzn.to/3xxJvlv

Link to UFOS AND THE NATIONAL SECURITY STATE, VOLUME 2: https://amzn.to/3UhdQ1l

Link to THE ALLAGASH ABDUCTIONS: https://amzn.to/3qNkLSg