A former US Air Force security officer has spoken publicly for the first time about a UFO sighting in California 20 years ago.

In October 2003, military contractors working for Boeing and Air Force police witnessed an unidentified flying object (UFO) described as a “gigantic floating red square” flying over an air base in California.

The object was over 100 yards long and was allegedly seen hovering over a launch site at Vandenberg Air Force Base, which is leased today by Elon Musk’s SpaceX.

The incident was not spoken about publicly for two decades, but recently came to light during sworn testimony given before Congress by Lt Ryan Graves in July.

Now, an ex-USAF senior patrolman, Jeff Nuccetelli, has come forward to shed further light on the eerie events.

“This is not a joke,” he told the Merged podcast on Tuesday. “These are contractors with top-secret clearances,” he said, emphasising the credibility of witnesses to the alleged sighting.

“These guys are trained observers,” he added. “They’re posted out there, you know, 24/7. They know what aircraft look like. They know what fishing boats look like.”

Mr Nuccetelli also revealed a second reported encounter with the “red square,” in which two of his fellow USAF police patrol officers “got buzzed by the UFO.”

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