Two Air Force colonels in a B-25 report delta-shaped craft over Carson Sink, Nevada

When
A B-25 Mitchell bomber in flight at an airshow
A B-25 Mitchell, the aircraft type the two colonels were flying in July 1952 Airwolfhound from Hertfordshire, UK, CC BY-SA 2.0, via Wikimedia Commons

Two Pentagon-based Air Force colonels flying a B-25 from Hamilton AFB reported three silver, tailless delta craft passing them at high speed over Carson Sink. Blue Book chief Edward Ruppelt wrote that checks for aircraft and balloons found nothing and the case stayed unknown.

Sources

  1. FirsthandThe Report on Unidentified Flying Objects (Edward J. Ruppelt, 1956) (opens in a new tab)Project Gutenberg / 1956

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